单项选择题

标准齿轮若想正确啮合,符合条件是(         )。
A、模数相等
B、分度圆压力角相等
C、分度圆压力角和模数都相等
D、分度圆压力角和模数都不相等

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单项选择题

-We should not only study all the time.
-We should go out and practice.

A.We should only study all the time in opposition to going out and practice.
B.We should go out and practice as opposed to only studying all the time.