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Terms for subject Communications (4323 entries)

unit-block type relay interlocking	组合式电气集中联锁
unloaded antenna	无负载空载天线
unlocking clearance	不锁闭间隙
unpacking inspection	开箱检验
Unstructured Supplementary Service Data	非结构化的补充业务数据
unsuccessful call	未完成呼叫
up direction throat	上行咽喉
up link	上行线路
up-and-down hump yard	双向驼峰编组场
upper cut-off frequency	通频带上限
upper cut-off frequency	频谱上限
upper cut-off frequency	通带〔频谱〕上限
upstream fault indication	上游故障指示
usable field strength	可用场强
useful part of time slot	时隙的有用部分
user identification number	用户识别码
User-to-User Signaling	用户到用户信令
User-to-User Signaling	用户至用户信令
User-to-User Signaling type 1	用户到用户信令类型1
V beam	V形波束