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【单选题】

齿轮的齿厚是指( )上的齿厚。

A.
分度圆
B.
齿顶圆
C.
齿根圆
D.
都一样
题目标签:齿轮齿厚
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参考解析:
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举一反三

【单选题】Passage 3 Questions 11 to 15 are based on the following passage: Scientists in India have invented a new way to produce electricity. Their invention does not get its power from oil, coal or other fuel...

A.
Because bullocks have long been used by Indian people
B.
Because bullocks walk slowly and are easy to control.
C.
Because there are few non-working bullocks in India
D.
Because there is not enough oil in India.