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【单选题】

为了提高齿轮的接触强度应()

A.
增大模数,但中心距不变
B.
增大中心距
C.
中心距不变,增大齿数
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参考答案:
参考解析:
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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.

【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

【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