题目内容
Volumetric speed regulation of variable displacemetn pump- fixed displacement motor belongs to constant torque speed regulation ( )
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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 ( )
The outlet pressure of two parallel-connected pressure reducing valves is determined by the valve with high setting pressure ( )
Static liquid only bears normal force, not shearing force and pulling force ( )
The sequence valve can control the outlet pressure of the valve to be stable ( )
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