如下图所示，两级放大电路的输入电阻和信号源内阻无关。
正确
错误

A、A B、B C、C D、D

单项选择题
A、A
B、B
C、C
D、D

The Topic Sentence of the Body part in a picture compos...

多项选择题The Topic Sentence of the Body part in a picture composition should .（ ）

The term “英雄” was first mentioned in two of China’s ear...

问答题 The term “英雄” was first mentioned in two of China’s earliest history books ―Zuo Zhuan and __________.