短語詞組短語guard van valve 車長閥guard s valve 車長閥turbine guard valve 水輪機(jī)保護(hù)閥guard s van valve 車長閥guard against error valve 保險閥guard 's van valve 車長閥;守車制動閥valve guard 閥箱;閥限位器;閥檔板;閥片行程限制器delivery valve guard 吐出閥限位器 返回 guard valve