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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】米制蜗杆的齿形角为( )。
A.
20°
B.
30°
C.
40°
D.
60°
【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】蜗杆的直径系数q=()。
A.
q=d1/m
B.
q=d1m
C.
q=a/d
D.
q=a/m
【单选题】齿轮的润滑主要靠（）
A.
边界油膜
B.
刚性油膜
C.
弹性油膜
【单选题】米制蜗杆的齿形角为（）。
A.
40°
B.
30°
C.
20°
D.
29°
【判断题】蜗杆的分度圆直径为d1=m×z1。
A.
正确
B.
错误
【单选题】变齿原蜗杆的导程有（）个。
A.
1
B.
2
C.
3
D.
4
【单选题】右旋蜗杆的是哪个？（）
A.
B.
【判断题】蜗杆的模数是指径向模数。
A.
正确
B.
错误
【多选题】开式齿轮的主要失效形式是__。
A.
轮齿折断
B.
齿面磨损
C.
齿面胶合
D.
齿面点蚀
【多选题】滚刀基本蜗杆类型有（ ）
A.
渐开线蜗杆
B.
阿基米德蜗杆
C.
法向直廓蜗杆
【单选题】米制蜗杆的齿形角为()。
A.
14o30
B.
30o
C.
20o
D.
40o
【单选题】齿轮的渐开线形状取决于它的（）直径。
A.
齿顶圆
B.
分度圆
C.
基圆
D.
齿根圆
【判断题】自动变速器中的齿轮都是行星齿轮。()
A.
正确
B.
错误
【单选题】只要（）的齿轮就能互相啮合。
A.
齿数和模数相同
B.
模数和压力角相同