短語詞組短語switching -over of train 列車轉(zhuǎn)線capacitor switching -over 電容器切換Switching -over valve 切換閥門quick acting switching -over 快速轉(zhuǎn)接optimum switching -over time 最佳切換時(shí)間quick - acting switching-over 速動(dòng)轉(zhuǎn)接over switching over 切換 返回 switching over