Terms for subject Communications containing Back

English	Chinese
answer back unit	自动应答机构
back bias	回授〔反馈〕 偏压
back number	过时的方法〔东西〕
back number	过期的杂志〔期刊〕
back numbers	过期期刊
back numbers	杂志等的前面几期
front and back shunting signal	双面调车信号机
humping back signal	后退信号
information feed-back repetition	信息反馈重发
locomotive turn-back operation	机车折返作业
midway turn-back	中途折返
relay back coil	继电器后线圈
ring back tone	回铃音
shunting midway turn-back	调车中途折返
turn-back route for a single shunting locomotive	调车机单机折返进路
turning back	列车折返