题目内容
A 3 phase induction motors do not need a start winding or a Centrifugal switch as it has a RMF (rotate magnetic field). A RMF makes a 3 phase induction motor self-starting
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A transformer can be used for reducing output voltage but also increasing the output voltage. But it’s only on AC. If connect a transformer to DC power supplier the transformer will be over heated
Select all electromagnetic devices you have learnt from this unit VU22496
Match the following advantageswithac, dc, and step motors
肥育主要以（）在体内的沉积为主。
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