[测] signal pole
... 无线电指向标(简称“电指向”) radio beacon 雷达应答器 radar responder 信号杆 signal pole ...
signal post
... signal polarity 信号极性 signal post 信号杆 signal power 信号功率 ...
semaphore
... semaphoresignal横杆信号 semaphore信号杆 semisubterraneanpowerplant半地下发电厂 ...
signal level
... signal level 信号电平 signal level 信号杆 signal level 信号级 ...