试题与答案

减速器齿轮啮合响声均匀轻快,噪声不超过()dB。A.90 B.85 C.80 D.7

题型:单项选择题

题目:

减速器齿轮啮合响声均匀轻快,噪声不超过()dB。

A.90

B.85

C.80

D.75

答案:

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