secondary line switch

电气英语词汇... ... scanning switch 换向开关 secondary line switch 第二级寻线机 rotary reverse switch 旋转反向开关 ...

插入反转控制器_馆档网 ... "secondary inductance" 次级感应" "secondary line switch" 次要线路开关" "secondary pole" 副极" ...

http://www.ptsgi.com/chinese... ... "第二级侍线机"," Secondary line switch" "第二进站号志机"," Second home signal" ...