题目内容
The check valve adopts a poppet valve structure to ensure a good reverse sealing performance ( )
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When a check valve is used as a back pressure valve, its spring should be replaced with a soft spring ( )
When the control port of the pilot operated check valve is not connected to pressure oil, its function is the same as that of the check valve ( )
The three-position five-way valve has three working positions and five channels ( )
The two-stage feed working circuit using two speed regulating valves in series will cause the impact movement of the working parts, so it is rarely used ( )
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