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【多选题】
展成法加工齿轮的特点有（）
A.
一把刀具可加工不同模数的齿轮
B.
加工精度高
C.
生产率较低
D.
需要专门的刀具和机床
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.