题目内容

The President is focusing on nuclear energy now because he needs to ____________ public attention from his economic record.

A. upgrade
B. divert
C. simulate
D. infect

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Even though your daughter has a shy ___________________, and may always be somewhat inhibited, you can help her alleviate some of her shyness.

A. coincidence
B. temperament
C. spirit
D. prejudice

某减速机采用斜齿圆柱齿轮传动，既受径向力又受轴向力作用，应优先选择下列哪种轴承

A. 深沟球轴承
B. 圆锥滚子轴承
C. 推力球轴承
D. 圆柱滚子轴承

某直齿圆柱齿轮传动的长轴，工作温度高，轴的热膨胀伸缩量大，应选择下列哪种支承结构A、两端单向固定 B、一端双向固定、一端游动 C、两端游动

A. 两端单向固定
B. 一端双向固定、一端游动
C. 两端游动
D. 以上都可以

人字齿轮传动的高速轴，应选择下列哪种支承结构

A. 两端单向固定
B. 一端双向固定、一端游动
C. 两端游动
D. 以上都可以