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【单选题】
渐开线标准直齿圆柱外啮合齿轮的齿根圆直径为 ( ) 。A.
、 mz
B.
、 mz-2h*am
C.
、 mz-h*am
D.
、 mz-2(h*a+c*)m
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举一反三
【单选题】Which of the following is true about workers retirement age?
A.
Workers retire at the age of 62 on average despite their unwillingness.
B.
The majority of the workers want to retire at the age of 65.
C.
More and more citizens want to retire at an older age.
D.
Retirement age has been extended since 1991.
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