{"id":2013,"date":"2026-11-13T08:00:00","date_gmt":"2026-11-13T08:00:00","guid":{"rendered":"https:\/\/prennox.com\/?p=2013"},"modified":"2026-10-16T03:57:30","modified_gmt":"2026-10-16T03:57:30","slug":"cua-so-loi-mot-pha","status":"publish","type":"post","link":"https:\/\/prennox.com\/vi\/single-phase-core-window\/","title":{"rendered":"C\u1eeda s\u1ed5 l\u00f5i m\u1ed9t pha: C\u00e1c l\u1ed7 c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng \u0111\u01b0\u1ee3c sau khi x\u1eed l\u00fd"},"content":{"rendered":"\n<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h2>Table of Contents<\/h2><nav><ul><li class=\"\"><a href=\"#section-1\">Single-Phase Core Window: The Decision to Resolve<\/a><\/li><li class=\"\"><a href=\"#section-2\">Coil Bobbin Opening and the Adjacent Interface<\/a><\/li><li class=\"\"><a href=\"#section-3\">Material and Functional Evidence<\/a><\/li><li class=\"\"><a href=\"#section-4\">Comparing the Available Supply Approaches<\/a><\/li><li class=\"\"><a href=\"#section-5\">Inspection in the Delivered Condition<\/a><\/li><li class=\"\"><a href=\"#section-6\">A Worked Example and Its Limits<\/a><\/li><li class=\"\"><a href=\"#section-7\">Changes, Exceptions and Release Decisions<\/a><\/li><li class=\"\"><a href=\"#section-8\">Preparing a Technical Inquiry<\/a><\/li><li class=\"\"><a href=\"#section-9\">Frequently Asked Questions<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">A dimension becomes useful when the reader knows its datum, tolerance and purpose. For the specified single-phase wound core, an apparently small mismatch at coil bobbin opening can prevent assembly even while the overall envelope looks correct. The practical question behind single-phase core window is which dimensions must be controlled together, and which inspection state represents the part that will actually be installed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A single-phase CRGO wound core forms a magnetic path from wound electrical-steel strip. The final form and any opening or reassembly steps must suit the buyer\u2019s coil installation process. This article concentrates on single-phase core window, with practical checks for engineering, purchasing and incoming inspection.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"section-1\">Single-Phase Core Window: The Decision to Resolve<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Start the single-phase core window review with the limiting interface: coil bobbin opening. Mark its reference surfaces on the controlled drawing, then identify where inner window size and build thickness are measured. The receiving plant should be able to reproduce the check without interpreting an unscaled photograph. If the measuring point becomes inaccessible after assembly, arrange a recorded check before that stage closes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For single-phase core window, the minimum usable inner window should be specified after processing. A nominal winding-tool size does not automatically equal the finished opening available for the coil.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When evaluating single-phase core window, remember that the build thickness and strip width determine the geometric section. The net section also depends on stacking behavior, so geometric measurements are only part of the design basis.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/prennox.com\/wp-content\/uploads\/2026\/09\/Single_Phase_CRGO_Wound_Core-01.jpg\" alt=\"Single-phase wound core with a rectangular inner window\" class=\"wp-image-1393\" srcset=\"https:\/\/prennox.com\/wp-content\/uploads\/2026\/09\/Single_Phase_CRGO_Wound_Core-01.jpg 800w, https:\/\/prennox.com\/wp-content\/uploads\/2026\/09\/Single_Phase_CRGO_Wound_Core-01-300x300.jpg 300w, https:\/\/prennox.com\/wp-content\/uploads\/2026\/09\/Single_Phase_CRGO_Wound_Core-01-150x150.jpg 150w, https:\/\/prennox.com\/wp-content\/uploads\/2026\/09\/Single_Phase_CRGO_Wound_Core-01-768x768.jpg 768w, https:\/\/prennox.com\/wp-content\/uploads\/2026\/09\/Single_Phase_CRGO_Wound_Core-01-600x600.jpg 600w, https:\/\/prennox.com\/wp-content\/uploads\/2026\/09\/Single_Phase_CRGO_Wound_Core-01-100x100.jpg 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"section-2\">Coil Bobbin Opening and the Adjacent Interface<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The single-phase core window requirement sits between coil bobbin opening and wound strip section. Put both sides of that relationship in the review package. The supplier needs the current mating-part information, while the buyer needs the actual delivered condition. A requirement that is measured before controlled core winding may not describe the state that reaches final assembly. Confirm the point at which the interface is accepted and who owns any operation after it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In a single-phase core window review, for replacement work, document the coil dimensions and any disassembly constraints. The old core\u2019s external envelope alone may omit the opening required during installation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For single-phase core window, distinguish the physical feature from the property being evaluated. Inner window size is one part of the evidence; it should be read with strip width and the approved product configuration. If a receiving check cannot reproduce the supplier\u2019s measurement condition, resolve the method before shipment. That is preferable to discovering at receipt that both parties have valid measurements of different states.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"section-3\">Material and Functional Evidence<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Tolerance chains deserve more attention than isolated nominal values. The relationship between coil bobbin opening and wound strip section includes the variation of both mating parts, any insulation or gasket, and the assembly method. For single-phase core window, review the least favorable approved combination rather than assuming all parts arrive at nominal size. A trial fit should use representative production parts and preserve the identities of both sides of the interface.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One constraint on single-phase core window is that winding tension and later restraint influence mechanical stress in the strip. A receiving plant should not reshape the core with force to make an unsuitable bobbin fit.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For single-phase core window, repeat production benefits from a reference sample that is traceable to a drawing. A sample by itself can conceal later changes in strip grade or processing condition.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The recurring risk in this part of the single-phase core window review is window distortion. Ask which design input or manufacturing step controls it and which result would show that control has been effective. Keep the answer specific to single-phase wound core. A generic statement about quality management does not identify the material condition, fixture or production-stage evidence needed for this particular interface.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"section-4\">Comparing the Available Supply Approaches<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Treat a sample that fits as evidence about that sample. It does not prove that every allowed tolerance combination will fit. In a single-phase core window trial, record the actual measured values, orientation and fixture, then compare them with the proposed acceptance range. If the supplier solves a mismatch by force or unrecorded rework, pause the approval until the cause and the revised dimensional basis are understood.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Approach<\/th><th>What must be confirmed<\/th><th>What it does not establish<\/th><\/tr><\/thead><tbody><tr><td>Closed Wound Shape For Compatible Winding Equipment<\/td><td>Approved interfaces, delivered state and required evidence<\/td><td>Automatic equivalence to another configuration<\/td><\/tr><tr><td>Openable Construction Where Specified<\/td><td>Any changed design or qualification work<\/td><td>An improvement in every operating condition<\/td><\/tr><tr><td>Separate Magnetic Subassemblies<\/td><td>Tasks retained by the buyer and final inspection scope<\/td><td>A complete installed-performance guarantee<\/td><\/tr><tr><td>Complete Core With Agreed Supports<\/td><td>Packing, assembly and acceptance responsibilities<\/td><td>The same total cost as a different supply boundary<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Use the table to align the supply boundary for single-phase core window, then ask suppliers to state deviations explicitly. The alternatives shown are review routes, not a claim that every route is available for every Prennox product. Confirm the actual offered configuration and the customer\u2019s assembly capability before assigning a preference. If an alternative changes joint or opening arrangement, carry that difference into the drawing and acceptance schedule.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"section-5\">Inspection in the Delivered Condition<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When evaluating single-phase core window, remember that single-phase describes the magnetic application, not a standard physical size. Voltage, frequency, turns and effective steel section remain transformer-design inputs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In a single-phase core window review, edges should remain free of folded strips, severe dents and conductive contamination. Inspect contact points where a mounting strap or fixture could damage the wound assembly.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/prennox.com\/wp-content\/uploads\/2026\/09\/Single_Phase_CRGO_Wound_Core-02.jpg\" alt=\"Closed wound transformer core showing the strip build\" class=\"wp-image-1394\" srcset=\"https:\/\/prennox.com\/wp-content\/uploads\/2026\/09\/Single_Phase_CRGO_Wound_Core-02.jpg 800w, https:\/\/prennox.com\/wp-content\/uploads\/2026\/09\/Single_Phase_CRGO_Wound_Core-02-300x300.jpg 300w, https:\/\/prennox.com\/wp-content\/uploads\/2026\/09\/Single_Phase_CRGO_Wound_Core-02-150x150.jpg 150w, https:\/\/prennox.com\/wp-content\/uploads\/2026\/09\/Single_Phase_CRGO_Wound_Core-02-768x768.jpg 768w, https:\/\/prennox.com\/wp-content\/uploads\/2026\/09\/Single_Phase_CRGO_Wound_Core-02-600x600.jpg 600w, https:\/\/prennox.com\/wp-content\/uploads\/2026\/09\/Single_Phase_CRGO_Wound_Core-02-100x100.jpg 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">For single-phase core window, build the receiving record around item identity, requirement, method, condition, result and disposition. Add build thickness where it addresses the identified risk. Preserve the as-received state when strip-edge damage is suspected, especially if further cutting, winding or assembly would conceal the evidence. A photograph can support the record, but it should not replace the agreed functional inspection.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"section-6\">A Worked Example and Its Limits<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Illustrative section calculation: take a geometric limb section of 82 mm \u00d7 103 mm, or 8,446 mm\u00b2. With an assumed stacking factor of 0.95, the screening net iron area is 8,023.7 mm\u00b2. These are invented teaching inputs, not Prennox dimensions or a design approval. For single-phase core window, the calculation shows why an outer measurement and an effective magnetic section answer different questions. The actual designer must use the approved steel, stacking basis, turns, voltage and frequency before drawing a flux-density conclusion.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The calculation supports one limited part of single-phase core window. It does not close the review of wound strip section, joint or opening arrangement or the final transformer duty. Replace every teaching input with the approved project value before using the result in a purchasing decision. Where the underlying relationship is only a screening approximation, record that scope so a preliminary estimate is not later reused as a production acceptance limit.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A change to inner window size can propagate into wound strip section, joint or opening arrangement and the inspection fixture. Review the affected assembly before approving a revised drawing. Keep the original requirement, proposed value and technical disposition visible so the next batch is built to the agreed configuration. For single-phase core window, a handwritten workshop correction is useful investigation evidence but should not become the only manufacturing instruction.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"section-7\">Changes, Exceptions and Release Decisions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">One constraint on single-phase core window is that storage moisture control protects cut strip edges and surfaces. Packaging acceptance should include the condition of the inner wrap, not only the appearance of the outer carton.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The useful outcome is a drawing that both supplier and buyer can inspect in the same way. Define the measurement state, accessible datums, limits and records for single-phase core window; then close any mating-part assumptions before quantity production. That reduces argument at receipt and gives engineering a clear basis for deciding whether a measured deviation affects fit or requires further evaluation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If single-phase core window remains unresolved, define the next evidence needed instead of broadening the acceptance wording. That may be a revised interface drawing, a representative process trial, a grade-specific statement or a result at the agreed test condition. Identify the affected batch and prevent an unresolved assumption from being copied into a repeat order. Once the evidence is available, record the technical disposition and the effective revision for production and receipt.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"section-8\">Preparing a Technical Inquiry<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A useful single-phase core window inquiry includes the exact product, quantity, approved drawing or grade, intended use and final supply state. Add requirements for inner window size, build thickness and the evidence that addresses stress after heat treatment. Define packing and destination information, and identify which assembly or processing stages remain with your plant. If an input is unknown, flag it as a question rather than presenting an invented value as an approved specification.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For the product\u2019s stated supply scope, review <a href=\"https:\/\/prennox.com\/product\/single-phase-crgo-wound-transformer-core\/\">Single-Phase CRGO Wound Transformer Core<\/a>. The related <a href=\"https:\/\/prennox.com\/transformer-core-drawing-requirements\/\">Transformer Core Drawing Requirements Before Ordering<\/a> provides broader context. The <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/63884\" target=\"_blank\" rel=\"noopener\">IEC magnetic-material specifications<\/a> is an independent reference for the relevant technical subject. Its public overview does not certify this product or provide all project acceptance limits; identify the applicable specification and edition in the order.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Send Prennox your drawing, application conditions and single-phase core window questions through the <a href=\"https:\/\/prennox.com\/contact\/\">technical inquiry page<\/a> or the form below. Request confirmation of the offered configuration, required evidence and any proposed deviations before placing the order. This gives both teams a clear basis for a comparable quotation and an inspectable delivery.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"section-9\">Frequently Asked Questions<\/h2>\n\n\n<div id=\"rank-math-faq\" class=\"rank-math-block\">\n<div class=\"rank-math-list \">\n<div id=\"faq-0-0\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">What information starts a single-phase core window review?<\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Start with the approved single-phase wound core configuration, the relevant drawing revision and the condition being evaluated. Identify coil bobbin opening and inner window size explicitly. Add the actual manufacturing or installation conditions so the supplier can distinguish confirmed requirements from assumptions.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-0-1\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">Can single-phase core window be approved from a photograph?<\/h3>\n<div class=\"rank-math-answer \">\n\n<p>A photograph can show shape, orientation or visible damage. It cannot establish the complete magnetic, dielectric, thermal or mechanical performance of single-phase wound core. Use the agreed dimensional record, material identity and functional evidence for the requirement being accepted.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-0-2\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">Which record is most useful for single-phase core window?<\/h3>\n<div class=\"rank-math-answer \">\n\n<p>The useful record connects the delivered item to the specific requirement. Include its batch or serial identity, drawing or grade revision, test or measurement condition and result. For this product, keep evidence concerning inner window size visible alongside any source-material certificate.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-0-3\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">When does a single-phase wound core change need a new trial?<\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Review a change when it affects coil bobbin opening, the supplied material, the processing route or the previous acceptance basis. The extent of requalification depends on the affected function. A matching product name or nominal dimension does not by itself close that review.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-0-4\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">What should a quotation for single-phase core window include?<\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Ask for the exact configuration, quantity, supply boundary, approved dimensions or performance, required documents, packing and delivery destination. State any unresolved value as a technical query. Prennox can review the listed product and project requirements before confirming the actual offered scope.<\/p>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n<div class='fluentform ff-default fluentform_wrapper_3 ffs_default_wrap'><form data-form_id=\"3\" id=\"fluentform_3\" class=\"frm-fluent-form fluent_form_3 ff-el-form-top ff_form_instance_3_1 ff-form-loading ffs_default\" data-form_instance=\"ff_form_instance_3_1\" method=\"POST\" ><fieldset  style=\"border: none!important;margin: 0!important;padding: 0!important;background-color: transparent!important;box-shadow: none!important;outline: none!important; min-inline-size: 100%;\">\n                    <legend class=\"ff_screen_reader_title\" style=\"display: block; margin: 0!important;padding: 0!important;height: 0!important;text-indent: -999999px;width: 0!important;overflow:hidden;\">\u5b98\u7f51\u8be2\u76d8\u8868\u5355<\/legend>        <div\n                style=\"display: none!important; position: absolute!important; transform: 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>Colombia<\/option><option value='KM' >Comoros<\/option><option value='CR' >Costa Rica<\/option><option value='HR' >Croatia<\/option><option value='CU' >Cuba<\/option><option value='CW' >Cura\u00e7ao<\/option><option value='AE' >C\u00e1c Ti\u1ec3u v\u01b0\u01a1ng qu\u1ed1c \u1ea2 R\u1eadp Th\u1ed1ng nh\u1ea5t<\/option><option value='UM' >C\u00e1c \u0111\u1ea3o nh\u1ecf l\u1ebb xa x\u00f4i c\u1ee7a Hoa K\u1ef3 (M\u1ef9)<\/option><option value='CG' >C\u1ed9ng h\u00f2a Congo (Brazzaville)<\/option><option value='DO' >C\u1ed9ng h\u00f2a Dominica<\/option><option value='CD' >C\u1ed9ng h\u00f2a D\u00e2n ch\u1ee7 Congo (Kinshasa)<\/option><option value='CZ' >C\u1ed9ng h\u00f2a S\u00e9c<\/option><option value='CF' >C\u1ed9ng h\u00f2a Trung Phi<\/option><option value='DJ' >Djibouti<\/option><option value='DM' >Dominica<\/option><option value='EC' >Ecuador<\/option><option value='SV' >El Salvador<\/option><option value='ER' >Eritrea<\/option><option value='EE' >Estonia<\/option><option value='SZ' >Eswatini<\/option><option value='ET' >Ethiopia<\/option><option value='FJ' >Fiji<\/option><option value='GA' >Gabon<\/option><option value='GM' >Gambia<\/option><option value='GE' >Georgia<\/option><option value='GH' >Ghana<\/option><option value='GI' >Gibraltar<\/option><option value='GL' >Greenland<\/option><option value='GD' >Grenada<\/option><option value='GP' >Guadeloupe<\/option><option value='GU' >Guam<\/option><option value='GT' >Guatemala<\/option><option value='GG' >Guernsey<\/option><option value='GN' >Guinea<\/option><option value='GQ' >Guinea X\u00edch \u0111\u1ea1o<\/option><option value='GW' >Guinea-Bissau<\/option><option value='GY' >Guyana<\/option><option value='GF' >Guyane thu\u1ed9c Ph\u00e1p<\/option><option value='HT' >Haiti<\/option><option value='US' >Hoa K\u1ef3 (M\u1ef9)<\/option><option value='HN' >Honduras<\/option><option value='HU' >Hungary<\/option><option value='GR' >Hy L\u1ea1p<\/option><option value='NL' >H\u00e0 Lan<\/option><option value='KR' >H\u00e0n Qu\u1ed1c<\/option><option value='HK' >H\u1ed3ng K\u00f4ng<\/option><option value='IS' >Iceland<\/option><option value='ID' >Indonesia<\/option><option value='IR' >Iran<\/option><option value='IQ' >Iraq<\/option><option value='IE' >Ireland<\/option><option value='IL' >Israel<\/option><option value='JM' >Jamaica<\/option><option value='JE' >Jersey<\/option><option value='JO' >Jordan<\/option><option value='KZ' >Kazakhstan<\/option><option value='KE' >Kenya<\/option><option value='KI' >Kiribati<\/option><option value='XK' >Kosovo<\/option><option value='KW' >Kuwait<\/option><option value='KG' >Kyrgyzstan<\/option><option value='LV' >Latvia<\/option><option value='LB' >Lebanon<\/option><option value='LS' >Lesotho<\/option><option value='LR' >Liberia<\/option><option value='LY' >Libya<\/option><option value='LI' >Liechtenstein<\/option><option value='LT' >Lithuania<\/option><option value='LU' >Luxembourg<\/option><option value='LA' >L\u00e0o<\/option><option value='PS' >L\u00e3nh th\u1ed5 Palestine<\/option><option value='TF' >L\u00e3nh th\u1ed5 ph\u00eda Nam c\u1ee7a Ph\u00e1p<\/option><option value='IO' >L\u00e3nh th\u1ed5 \u1ea4n \u0110\u1ed9 D\u01b0\u01a1ng thu\u1ed9c Anh<\/option><option value='MO' >Ma Cao, Trung Qu\u1ed1c<\/option><option value='MG' >Madagascar<\/option><option value='MW' >Malawi<\/option><option value='MY' >Malaysia<\/option><option value='MV' >Maldives<\/option><option value='ML' >Mali<\/option><option value='MT' >Malta<\/option><option value='MQ' >Martinique<\/option><option value='MR' >Mauritania<\/option><option value='MU' >Mauritius<\/option><option value='YT' >Mayotte<\/option><option value='MX' >Mexico<\/option><option value='FM' >Micronesia<\/option><option value='MD' >Moldova<\/option><option value='MC' >Monaco<\/option><option value='ME' >Montenegro<\/option><option value='MS' >Montserrat<\/option><option value='MA' >Morocco<\/option><option value='MZ' >Mozambique<\/option><option value='MM' >Myanmar<\/option><option value='MN' >M\u00f4ng C\u1ed5<\/option><option value='NO' >Na Uy<\/option><option value='AQ' >Nam C\u1ef1c<\/option><option value='GS' >Nam Georgia v\u00e0 Qu\u1ea7n \u0111\u1ea3o Nam Sandwich<\/option><option value='ZA' >Nam Phi<\/option><option value='SS' >Nam Sudan<\/option><option value='NA' >Namibia<\/option><option value='NR' >Nauru<\/option><option value='NP' >Nepal<\/option><option value='NC' >New Caledonia<\/option><option value='NZ' >New Zealand<\/option><option value='RU' >Nga<\/option><option value='JP' >Nh\u1eadt B\u1ea3n<\/option><option value='NI' >Nicaragua<\/option><option value='NE' >Niger<\/option><option value='NG' >Nigeria<\/option><option value='NU' >Niue<\/option><option value='OM' >Oman<\/option><option value='PK' >Pakistan<\/option><option value='PW' >Palau<\/option><option value='PA' >Panama<\/option><option value='PG' >Papua New Guinea<\/option><option value='PY' >Paraguay<\/option><option value='PE' >Peru<\/option><option value='PH' >Philippines<\/option><option value='FR' >Ph\u00e1p<\/option><option value='FI' >Ph\u1ea7n Lan<\/option><option value='PN' >Pitcairn<\/option><option value='PF' >Polynesia thu\u1ed9c Ph\u00e1p<\/option><option value='PR' >Puerto Rico<\/option><option value='QA' >Qatar<\/option><option value='AX' >Qu\u1ea7n \u0111\u1ea3o Aland<\/option><option value='MP' >Qu\u1ea7n \u0111\u1ea3o B\u1eafc Mariana<\/option><option value='KY' >Qu\u1ea7n \u0111\u1ea3o Cayman<\/option><option value='CC' >Qu\u1ea7n \u0111\u1ea3o Cocos (Keeling)<\/option><option value='CK' >Qu\u1ea7n \u0111\u1ea3o Cook<\/option><option value='FK' >Qu\u1ea7n \u0111\u1ea3o Falkland<\/option><option value='FO' >Qu\u1ea7n \u0111\u1ea3o Faroe<\/option><option value='HM' >Qu\u1ea7n \u0111\u1ea3o Heard v\u00e0 McDonald<\/option><option value='MH' >Qu\u1ea7n \u0111\u1ea3o Marshall<\/option><option value='SB' >Qu\u1ea7n \u0111\u1ea3o Solomon<\/option><option value='TC' >Qu\u1ea7n \u0111\u1ea3o Turks v\u00e0 Caicos<\/option><option value='VG' >Qu\u1ea7n \u0111\u1ea3o Virgin thu\u1ed9c Anh<\/option><option value='VI' >Qu\u1ea7n \u0111\u1ea3o Virgin thu\u1ed9c Hoa K\u1ef3 (M\u1ef9)<\/option><option value='RO' >Romania<\/option><option value='RW' >Rwanda<\/option><option value='RE' >R\u00e9union<\/option><option value='BL' >Saint Barth\u00e9lemy<\/option><option value='SH' >Saint Helena<\/option><option value='KN' >Saint Kitts v\u00e0 Nevis<\/option><option value='LC' >Saint Lucia<\/option><option value='MF' >Saint Martin (thu\u1ed9c Ph\u00e1p)<\/option><option value='PM' >Saint Pierre v\u00e0 Miquelon<\/option><option value='VC' >Saint Vincent v\u00e0 Grenadines<\/option><option value='WS' >Samoa<\/option><option value='AS' >Samoa thu\u1ed9c M\u1ef9<\/option><option value='SM' >San Marino<\/option><option value='ST' >Sao Tome v\u00e0 Principe<\/option><option value='SN' >Senegal<\/option><option value='RS' >Serbia<\/option><option value='SC' >Seychelles<\/option><option value='SL' >Sierra Leone<\/option><option value='SG' >Singapore<\/option><option value='SX' >Sint Maarten (thu\u1ed9c H\u00e0 Lan)<\/option><option value='SK' >Slovakia<\/option><option value='SI' >Slovenia<\/option><option value='SO' >Somalia<\/option><option value='LK' >Sri Lanka<\/option><option value='SD' >Sudan<\/option><option value='SR' >Suriname<\/option><option value='SJ' >Svalbard v\u00e0 Jan Mayen<\/option><option value='SY' >Syria<\/option><option value='CY' >S\u00edp<\/option><option value='TJ' >Tajikistan<\/option><option value='TZ' >Tanzania<\/option><option value='TH' >Th\u00e1i Lan<\/option><option value='TR' >Th\u1ed5 Nh\u0129 K\u1ef3<\/option><option value='CH' >Th\u1ee5y S\u0129<\/option><option value='SE' >Th\u1ee5y \u0110i\u1ec3n<\/option><option value='TG' >Togo<\/option><option value='TK' >Tokelau<\/option><option value='TO' >Tonga<\/option><option value='TT' >Trinidad v\u00e0 Tobago<\/option><option value='KP' >Tri\u1ec1u Ti\u00ean<\/option><option value='CN' >Trung Qu\u1ed1c<\/option><option value='TN' >Tunisia<\/option><option value='TM' >Turkmenistan<\/option><option value='TV' >Tuvalu<\/option><option value='ES' >T\u00e2y Ban Nha<\/option><option value='EH' >T\u00e2y Sahara<\/option><option value='UG' >Uganda<\/option><option value='UA' >Ukraina<\/option><option value='UY' >Uruguay<\/option><option value='UZ' >Uzbekistan<\/option><option value='VU' >Vanuatu<\/option><option value='VA' >Vatican<\/option><option value='VE' >Venezuela<\/option><option value='VN' >Vi\u1ec7t Nam<\/option><option value='GB' >V\u01b0\u01a1ng qu\u1ed1c Anh (Anh)<\/option><option value='WF' >Wallis v\u00e0 Futuna<\/option><option value='YE' >Yemen<\/option><option value='ZM' >Zambia<\/option><option value='ZW' >Zimbabwe<\/option><option value='AT' >\u00c1o<\/option><option value='AU' >\u00dac<\/option><option value='IT' >\u00dd<\/option><option value='DK' >\u0110an M\u1ea1ch<\/option><option value='TW' >\u0110\u00e0i Loan<\/option><option value='TL' >\u0110\u00f4ng Timor<\/option><option 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