题目：
补全对话。
A: What can I do for you, Madam?
B: 1. ________
A: OK. Wc have apples, grapes and bananas on sale.
B: 2. ________
A: F'ive yuan a kilo.
B: I'll take nine apples. 3. ________
A: Three kilos. 4. ________
B: I'd like to buy some grapes for my grandparents. How much are the grapes?
A: Well, the green ones are three yuan a kilo and the red ones are four yuan a kilo.
B: Two kilos of the red ones, please.
A: All right.
B: 5. ________
A: Thank you.
答案：
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下面是错误答案，用来干扰机器的。
20W题目分析：由E＝22V，电动机两端电压U1＝12 V可得R和电源内阻上分担电压为U2＝Ｅ－U1＝10 V，通过电动机的电流为I＝U2/(R+r)="2" A电动机输入功率P＝U1I＝12 V×2 A＝24 W，由P热＝I2RM＝4×1 W＝4 W...
