题目内容

PWM逆变电路多重化的目的有( )

A. 减小高次谐波
B. 减小低次谐波
C. 提高等效开关频率
D. 减小开关损耗

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改变载波频率可改变PWM逆变器的()

A. 开关频率
B. 输出信号波频率
C. 调制信号波频率
D. 一个周期内的pWM脉冲数

How does the "observer" carry out his assessment?

A. By wandering around the school and observing the teacher in a casual way.
By attending and evaluating the teacher's class in a formal way.

What does "dig into" mean here?

A. The lable rubs against the body in a painful way.
B. The lable pushes hard into the body and it makes Bradley bleed.

1992年10月,中共十四大在北京举行。报告明确指出,我国经济体制改革的目标是()。

A. 建立社会主义市场经济体制
B. 加强国家宏观调控
C. 改革开放
D. 国民生产总值比1980年翻一番

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