常见例句雙語例句The hex nipple or connector housing design allows for ease in installation either as a check valve, vacuum breaker or low-pressure relief valve.螺紋接套或封裝式連接使得閥門無論用作止廻閥、真空破壞器，還是用作低壓泄壓閥都更爲方便。www.e-gtm.com.cn 返回 hex nipple