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【单选题】
一对作无齿侧间隙啮合传动的直齿圆柱齿轮,当要求其中心距a′小于标准中心距 a 时,应采用 。
A.
标准齿轮传动
B.
零传动
C.
正传动
D.
负传动
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A.
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B.
the government is reluctant to let it charge the students high tuition fees
C.
it has to pay sufficient salaries to attract top teachers
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