| 单词 | NXX |
| 释义 | NXX The central office (CO) prefix, also known as the central office exchange (COE) code is a three-digit number that identifies the central office and the associated geographic carrier serving area (CSA). The CO prefix specifies the dialing pattern NXX, with N indicating that only numbers 2–9 are allowed, 74570c14.qxd 9/11/07 12:26 PM Page 344 |
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科学参考收录了5291条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。