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| 通用服务指令码 | |||
| 原 Bell System 的通用业务程序代码 | |||
| English thesaurus | |||
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| USOC (e.g., for telephone jacks: RJ - Registered Jack; C - flush or surface mount jack; W - Wall mount Jack; X - complex multi-line or series type jack) | |||
| USOC | |||
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