题目内容
Check valve, relief valve, throttle valve can all be used as back pressure valve ()
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The outlet throttle speed control circuit with speed-regulating valve has only throttle loss and no relief loss ()
In the inlet throttle control circuit, the speed stiffness is related to the throttle valve flow area A and the load FL, but has nothing to do with the pump outlet pressure pp ( )
Moist air is a mixture of dry air and water vapor ( )
During the isothermal process, the internal energy of the gas remains unchanged because there is no heat exchange between the gas and the outside world ( )
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