短語(yǔ)詞組短語(yǔ)protection relief valve 防護(hù)安全閥flood protection material valve 舷側(cè)通海閥protection n valve 安全閥fire protection pilot valve 防火滑閥protection relief valve setting 防護(hù)安全閥的調(diào)定air pressure protection valve 氣壓保護(hù)閥tractor protection valve 牽引車(chē)保護(hù)閥PPV pressure protection valve 過(guò)壓保護(hù)閥system protection valve operation 系統(tǒng)保護(hù)閥的工作 返回 protection valve