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参考解析：
刷刷题刷刷变学霸
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.
【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】通常英制牙标上蜗轮之齿数为车床导螺杆每25.4公厘螺纹数的：（）
A.
2
B.
4
C.
6
D.
8倍。
【单选题】用标准齿条型刀具加工ha*=1、α=20°的渐开线标准直齿轮时，不发生根切的最少齿数为()
A.
l4
B.
l5
C.
l6
D.
17
【单选题】范成法多用于（）。
A.
单件生产
B.
批量生产
【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】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
【单选题】范成法加工齿轮,滚刀和轮坯的工作关系本质是()?
A.
齿条和齿条啮合
B.
齿条和齿轮啮合
C.
齿轮和齿轮啮合
【单选题】定轴轮系传动比的大小与轮系中惰轮的齿数( )
A.
关
B.
有关，成正比
C.
有关，成反比
D.
有关，不成比例