题目内容
The pneumatic control directional valve can use the gas pressure to move the main spool and change the direction of the gas ( )
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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.
The motion speed of piston in actuator only depends on the_____________.
From an operational standpoint, any hydraulic system can be divided into _______logical segments.
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