放大电路中,凡是串联反馈,其反馈量()
A、一定是电压
B、一定是电流
C、电压、电流都可能
D、为0
参考答案:A
根据句意及首字母提示,完成单词拼写。
1. Jim is two years y_____________ than Ben.
2. I often go to school on foot, but s_____________ by bus.
3. She can p_____________ the book on her finger, but I can't.
4. I want to w_____________ an e-mail.
5. Mr Black comes from England. He is l_____________ in Australia.
《十面埋伏》是一首具有代表性的()。
A.文曲
B.武曲
C.军曲
D.古曲