题目内容
The working pressure of the hydraulic motor depends on the load and has nothing to do with its sealing performance ( )
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Y-shaped sealing ring is suitable for sealing at high speed ( )
Paper core filter has higher pressure resistance than sintered (烧结式) filter ( )
High-pressure and large-flow hydraulic systems often use electromagnetic directional control valves to control ( )
In the bypass throttle speed control circuit, a large amount of hydraulic oil is returned to the tank by the pressure relief valve, which is the main reason for the large energy loss, temperature rise, and low efficiency ( )
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