放大电路的放大倍数是输出变化量的幅值与输入变化量的幅值之比。()
参考答案:对
解释下列词语。
①戏谑:____________________________________。
②大言不惭:____________________________________。
③步履蹒跚:____________________________________。
---What made you so_________?
---Oh, Mr Wu told us a funny story and it made us _________.
A.happy, to laugh
B.happily, to laugh
C.happy, laugh
D.happily, laugh