A.one slip-ring
B.two sliprings
C.three sliprings
D.four sliprings
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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
A.is small
B.may be neglected
C.is useful
D.is considerable
A.remained
B.still
C.no longer
D.much mere
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