水力粗糙的

spring-loaded brake, hydraulically-released vehicle

hydraulically actuated diaphragm metering pump【机】

hydraulically-loaded pre-stressed rolling mill

hydraulic drive【机】;hydraulic gear【机】;hydraulically driving arrangement【机】

hydraulic clutch【机】;hydraulically controlled clutch【机】

hydraulically balanced valve

hydraulically controlled clutch

hydraulically operated clutch