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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.
【单选题】用齿条刀具加工渐开线齿轮时，判断被加工齿轮产生根切的依据是（）。
A.
刀具的齿顶线通过啮合极限点N1
B.
刀具的齿顶线超过啮合极限点N1
C.
刀具的中线超过啮合极限点N1
D.
刀具的中线不超过啮合极限点N1