短語(yǔ)詞組短語(yǔ)proportional control valve 比例控制閥Proportional throttle valve 比例節(jié)流閥proportional reversing valve 比例換向閥proportional flow valve 氣動(dòng)比例流量閥的研究proportional reducing valve 比例減壓閥Proportional solenoid valve unit 發(fā)明名稱(chēng)electrical proportional direction valve 氣動(dòng)電控比例方向閥seawater proportional relief valve 海水比例溢流閥 返回 proportional valve