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【多选题】
渐开线齿廓齿轮的特点有（）
A.
发生线沿基圆滚过的长度，等于基圆上被滚动过的圆弧长。
B.
渐开线上任意一点的法线必与基圆相切
C.
渐开线上各点的曲率半径不相等但在基圆上为0
D.
渐开线的形状决定基圆的大小，基圆越小，渐开线越弯曲；基圆越大，渐开线越平直；当基圆半径为无穷大时，渐开线将成为一条直线
E.
基圆内无渐开线
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参考答案：
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.
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.
参考解析：
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