?继电器活塞

... relay performance test；继电器性能测试 relay piston；继电器活塞 relay servo piston；继电器伺服活塞 ...

?自动转换活塞

... relay picked up ==> 吸起的继电器 relay pickup value ==> 继电器始动值 relay piston ==> 自动转换活塞,调节器一次滑阀,从 ...