5. 离婚不是一件能轻易忘却的事情。
A. Divorce is not something that is easy to get over.
B. Divorce is not a thing that is easy to over.
C. Divorce is not something which is easy to get over.
Divorce is not easy to forget.
P53 F. Complete the sentences with expressions from the boxes. (注意答案中应该去掉单词的首字母)
两级放大器中各级的电压增益分别是20dB 和 40dB 时,总的电压增益为( )
A. 60dB
B. 80dB
C. 800dB
D. 20dB
直接耦合与阻容耦合的多级放大电路之间的主要不同点是( )
A. 放大的信号不同
B. 直流通路不同
C. 交流通路不同