题目内容

Don't be afraid to correct your ____ when you are speaking, if you realise you have made any

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Record yourself and ___ backwardsd

The IElTS speaking score is assigned at the __ of the test

为了起振容易,反馈型正弦波振荡器起振时的工作状态应设置为( )。

A. 丙类
B. 乙类
C. 甲类

反馈型正弦波振荡器的振幅平衡条件是( )。

AF>1
B. AF=1
C. AF<1

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