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【单选题】
如果齿轮的接触疲劳强度不够，可通过增大齿轮的（ ）来提高。A.
模数 m
B.
分度圆直径 d 1
C.
压力角
D.
以上都不正确
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举一反三
【单选题】—I miss my mother very much. She has gone abroad on business for nearly a year but luckily she will be back in a week. —Pardon? I ______ something else just now. ________ will she come back?
A.
was thinking; How long
B.
thought; How often
C.
was thinking; How soon
D.
thought; When
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