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【单选题】
公用齿轮是指前一变速组的( ),又是后一变速组的( )。A.
从动齿轮，主动齿轮
B.
从动齿轮，从动齿轮
C.
主动齿轮，从动齿轮
D.
主动齿轮，主动齿轮
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皮皮学刷刷变学霸
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A.
a ctive
B.
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C.
o ptimistic
D.
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