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【单选题】
渐开线齿轮是以（）作为齿廓的齿轮。
A.
同一基圆上产生的两条反向渐开线
B.
任意两条反向渐开线
C.
必须是两个基圆半径不同所产生的两条反向渐开线
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参考答案：
参考解析：
刷刷题刷刷变学霸
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.