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【单选题】
轮系的传动比,等于组成该轮系的()。
A.
所有从动齿轮齿数和与所有主动齿轮齿数和之比
B.
所有主动齿轮齿数和与所有从动齿轮齿数和之比
C.
所有从动齿轮齿数连乘积与所有主动齿轮齿数连乘积之比
D.
所有主动齿轮齿数连乘积与所有从动齿轮齿数连乘积之比
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