A.opposite polarity
B.the same polarity
C.negative polarity
D.positive polarity
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A.larger and heavier than
B.as much as
C.smaller and lighter than
D.more dangerous than
A.one slip-ring
B.two sliprings
C.three sliprings
D.four sliprings
A.stationary；rotate
B.stationary；stationary
C.rotate；stationary
D.rotate；rotate
A.sine
B.cosine
C.tangent
D.cotangent
A.one
B.less than one
C.more than one
D.negative one
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