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【简答题】
根据I栏中的问句从Ⅱ栏中选出合适的答语。 I 1. What are you doing? 2. Can I help you, sir? 3. Is there a post office near here? 4. What does she do? 5. Where did you go on vacation? 6. What does he look like? 7. How's it going? 8. Is Jack there? 9. How is the weather? 10. How about going to the park? Ⅱ A. She's a shop assistant. B. Yes, I'd like a belt. C. OK, let's go. D. I'm looking for my key ring. E. Sorry. I'm new here. F. Great. G. Yes, he is． H. We went to Beijing. I. He's tall. J. It's hot and humid.
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举一反三
【简答题】如图13.8.4所示电路在t＜0时已处于稳态。t=0时刻开关S闭合，求t≥0时的u(t)。
【单选题】国内过夜旅游者是指我国大陆居民离开长住地在境内其他地方的旅游住宿设施内至少停留一夜,最长不超过( )个月的国内游客;
A.
3个月
B.
6个月
C.
9个月
D.
12个月
【简答题】如图7．30所示的电路，t0时的u(t)，并画出u(t)的波形。