题目内容
Moist air is a mixture of dry air and water vapor ( )
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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 ( )
The performance of pneumatic cylinder on no-load requires that the pneumatic cylinder should run smoothly without creeping under certain limited pressure ( )
Volumetric speed regulation of variable displacemetn pump- fixed displacement motor belongs to constant torque speed regulation ( )
When the liquid flows, if the pressure, flow rate and density at any point in the liquid do not change with time, this kind of flow is called constant flow ( )
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