短語詞組短語proportional fluid amplifier 射流比例放大器proportional control amplifier 比例控制放大器proportional controllable amplifier 比例控制放大器fluidic proportional amplifier 液體比例放大器electro hydraulic proportional amplifier 電液比例放大器electrohydraulic proportional amplifier 電液比例放大器proportional amplifier plate 比例放大板beam deflection type proportional amplifier 射束偏轉形比例放大器 返回 proportional amplifier