Motor controller for up-down stage automatically, double red light for focusing, multi-humanized design.
电动升降，双红光对焦，多项人性化设计。
When the dynamic force produced by a single motor is insufficient, the mode of multi-stage relay can be taken.
如单个电机所产生的动力不足，可以采取多级接力方式。
The pump consists of prime motor, multi stage centrifugal pump, seat, wire and control, in which the key part is the prime motor.
它由电念头、多级离心泵、底座、电缆和节制屏构成，个中电念头是该系统的要害部件。
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