常见例句双语例句The hex nipple or connector housing design allows for ease in installation either as a check valve, vacuum breaker or low-pressure relief valve.螺纹接套或封装式连接使得阀门无论用作止回阀、真空破坏器，还是用作低压泄压阀都更为方便。www.e-gtm.com.cn 返回 hex nipple