... signal repeater 信号复示器sonar repeater 声纳复示器 signal responder unit 信号应答器 signal rocket 信号火箭 ...
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起飞几个小时之后，航空公司停止了所有通信，飞机应答器信号消失，无从定位，为这次空难事件盖上了神秘面纱。
Within a couple hours of departure, the airline ceased all communication and its transponder has never been located wrapping the tragic flight in a veil of mystery.
发射机应答器便会自动发出信号。
站间是以车载设备为主的，由无源点式应答器、GPS列车卫星定位系统、多机校核系统构成的列车信号引导系统。
The train signal guiding system (on board) consisting of passive intermittent responder, train GPS system, and multiple computer checking system are equipped on the section.
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