题目内容
The compressed air used in the pneumatic transmission system must be dried and purified before it can be used ( )
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Pneumatic motor is a device that converts the pressure energy of compressed air into linear motion mechanical energy ( )
The pneumatic control directional valve can use the gas pressure to move the main spool and change the direction of the gas ( )
In the spool valve, hydraulic fluid acts as sealant to reduce leakage.
The first important lawof hydraulic transmission is that the working pressure in the hydraulic system depends on the________load.
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