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【单选题】
设对称式锥齿轮差速器壳的转速为n 0 ，左、右两侧半轴齿轮的转速分别为n 1 和n 2 ，则有（）A.
n 1 +n 2 =n 0
B.
n 1 ＋n 2 =2n
C.
n 1 +n 2 =1/2n 0
D.
n 1 =n 2 =n 0
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