题目内容

单闭环直流调速系统可以采用比例调节器，也可以采用PI调节器。

A. 对
B. 错

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有静差系统带负载稳态运行时有转速降落，无静差系统带负载稳态运行时无转速降落。

A. 对
B. 错

I want to suggest that there are equally ________________ explanations for the associations they claim to identify.

A. probable
B. possible
C. proportional
D. plausible

He pushed her accidentally, and she ________________ backwards to an almost fall.

A. trembled
B. shivered
C. staggered
D. leaned

Overseas debt of this country is ________________

A. horrified
B. underestimating
C. astonished
D. staggering