短語(yǔ)詞組短語(yǔ)change e valve 換向閥hand change over valve 手動(dòng)換向閥pneumatic change direction valve 氣動(dòng)換向閥change direction valve 換向閥electromagnetism change direction valve 電磁換向閥the change over valve 調(diào)壓閥change -valve 轉(zhuǎn)換閥piston buffer change valve 活塞式緩變閥 返回 change valve