A.stationary；rotate
B.stationary；stationary
C.rotate；stationary
D.rotate；rotate
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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
A.Desired value
B.Set value
C.Measured value
D.Deviation
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