题目内容
Compressed air has lubricating properties ( )
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In a pneumatic system, generally, a muffler should be installed at the exhaust port of the directional control valve ()
Pneumatic circuit generally does not have exhaust pipe ( )
Hydraulic transmission is not easy to obtain a large force and torque ( )
The working pressure of the hydraulic motor depends on the load and has nothing to do with its sealing performance ( )
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