speed control by constant power
... speed control by constant torque 恒转矩调速 speed control by constant power 恒功率调速 constant control valve 恒定控制阀 ...
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By-passing to control the pressure at a constant speed is easily accomplished, but it wastes power.
容易实现用旁通控制在恒定转速下的压力，但旁通浪费能量。
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