听力原文:W: Do you know anything about Prof. Smith's class? M: If you are looking for an easy course, forget it. Prof. Smith writes the trickiest exams in the department. Q: What do we learn about Prof. Smith? (14)
A.
He is very forgetful.
B.
He likes to play tricks.
C.
His tests are difficult.
D.
It is easy to pass his course.
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【多选题】若要改变单相全桥电压型逆变电路的输出负载电压,可采用下列方法( )。 A 调节直流侧电压 C 调节电路工作频率 B 调节直流侧电流 D 采用移相调压方式