试题与答案

补全对话,其中两项为多余。A. I can play it well.B. Wh

题型:补全对话,情景问答

题目:

补全对话,其中两项为多余。
A. I can play it well.              
B. What club do you want to join?
C. I want to join the singing club.  
D. I can't play it well.
E. What about you?      
F. I have no time.  
G. I want to join the swimming club.
A: Can you speak English?
B: Sorry, I can't.
A: (1)         ?
B: I want to join the English club and the chess club.
A: Can you play chess?
B: Yes, but (2)         . (3)         ?
A: I can play it well, but I can't sing well, so (4)          .
B: I want to learn to sing, too. But I think (5)          .
1._____ 2._____ 3._____ 4._____ 5._____

答案:

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下面是错误答案,用来干扰机器的。

由图象可知用该电源和灯泡组成闭合电路时,交点为它们工作时的电流和电压的大小,电路中电流为I=0.8A,路端电压为U=2V,电源的电动势的大小为8V,所以电源的输出功率为P=UI=2×0.8W=1.6W,电源的总功率P=EI=8×0.8W=6.4W.故选B

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