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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.
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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.
【单选题】一对啮合的标准直齿圆柱轮，其( )一定相切。
A.
齿顶圆
B.
分度圆
C.
齿根圆
D.
齿顶高
【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】一级啮合传动且转向一致的是( )传动。
A.
圆锥齿轮
B.
内啮合齿轮
C.
外啮合齿轮
D.
蜗轮蜗杆
【单选题】锥齿轮啮合质量的检验,应包括( )的检验。
A.
侧隙和接触斑点
B.
侧隙和圆跳动
C.
接触斑点和圆跳动
D.
侧隙、接触斑点和圆跳动
【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
【判断题】只要使齿扇轴相对于齿条作轴向移动,便可调整二者的啮合间隙。
A.
正确
B.
错误
【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