可控硅管具有（）作用。A.放大 B.整流 C.检波_爱下问搜题

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问题单项选择题

可控硅管具有（）作用。

A.放大

B.整流

C.检波

答案

参考答案：B

选择题

一 Your colleague's spoken English is beautiful, Lily.
一 It's no wonder. She _____ in the USA for a year as a visiting professor.

A. worked
B. has worked
C. had worked
D. has been working

选择题

David's brother is a teacher. He works in a _____.

A. factory

B. hotel

C. hospital

D. university