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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
【多选题】提高零件表面接触强度的措施有______。
A.
增大综合曲率半径
B.
改为开式工况
C.
将外接触改为内接触
D.
提高表面硬度
E.
采用适当黏度的润滑油
【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】在型芯中放置芯骨是为了提高型芯的强度。
A.
正确
B.
错误
【判断题】选用钢丝绳的强度越高越好。(判断题)
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
【判断题】甲类钢随钢号的增大，钢的强度降低，而塑性增加。
A.
正确
B.
错误
【单选题】测量磁感应强度常用()
A.
伏安法
B.
电位差计法
C.
电桥法
D.
霍尔效应法