题目内容

互锁装置的作用是

A. 防止两根拨叉轴同时移动
B. 防止两根拨叉同时移动
C. 实现拨叉轴之间的相互锁止
D. 实现单个拨叉轴的锁止

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15. The news quickly spread throughout the campus _______ he won the first prize in the competition.

A. which
B. what
C. that
D. who

Ms. Peng’s work, a meditation on the relationship between nature and man, was later shown in an art gallery and spent a month on 1________ in a mall. “It 2_______ changed me,” Ms. Peng says of the 3________. “It’s given me the 4________ to build things like that in the future.”

()的定向移动形成了电流。

A. 正电荷
B. 负电荷
C. 带电粒子
D. 静电荷

电流的国际单位制是()。

A. 毫安
B. 安培
C. 千安
D. 微安

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