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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：
【判断题】对于标准齿轮,在分度圆上,齿槽宽等于齿厚。
A.
正确
B.
错误
【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】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】在绘制齿轮时其分度圆用()绘制。
A.
粗实线
B.
细实线
C.
细点画线
D.
虚线
【多选题】齿轮偏心为齿轮的回转中心与分度圆中心不重合，包括（）。
A.
扇形齿轮偏心
B.
轴齿偏心
C.
片齿轮偏心
D.
中心齿轮偏心
【判断题】单个齿轮既有分度圆，又有节圆
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
【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】齿轮的分度圆用（）绘制。
A.
粗实线；
B.
细实线；
C.
点划线；
D.
双点划线。
【判断题】我国通用标准齿轮分度圆上的压力角是20°。
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
【判断题】单个齿轮既有分度圆又有节圆。 答案:
A.
正确
B.
错误
【单选题】负变位齿轮的分度圆齿槽宽 标准齿轮的分度圆齿槽宽。
A.
大于
B.
等于
C.
小于
D.
小于且等于