题目内容

A nail has got into the machine. That’s ________ is wrong with it.

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

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We should stick to ________ is true.

A. which
B. that
C. anything
D. whatever

Pollution affects more people living in today’s society ________ it did those in the past.

A. as
B. since
C. than
D. after

在自动控制原理中，劳斯判据是用来干什么的？

A. 判断系统平稳性
B. 判断系统稳定性
C. 分析系统快速性

二阶系统中稳定性、平稳性、快速性、准确性都不错的是以下哪一个系统？

A. 阻尼比>1
B. 0<阻尼比<1
C. 阻尼比<0