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【多选题】
有关分度圆、标准齿轮的说法,正确的是 。
A.
标准齿轮就是模数、压力角及齿顶高系数均为标准值的齿轮
B.
齿厚和齿槽宽相等的圆就是分度圆
C.
标准齿轮 是指分度圆上具有标准模数 m 、标准压力角 a 、以及标准齿顶高和标准齿根高，且 s = e = π m /2 的齿轮
D.
分度圆是齿轮上具有标准模数和标准压力角的圆
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【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.
相关题目：
【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.
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