题目:
从方框中选择恰当的句子,补全对话。(每题1分,共5分) A: Do you like living in the city or the countryside? B: 小题1: A: But I think the countryside is much better than the city for living. B: 小题2: A: Because there is terrible traffic and too much noise in the city. B: 小题3: I think the city is a wonderful place to live in, because we can go to parties, concerts and operas every day if we like. 小题4: A: 小题5: But I like living in a quiet and safe place.
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答案:
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2 1 分析:根据闭合电路欧姆定律I=E/(r+R),进行数学变形,得到R与1/I的关系式,根据数学知识研究1/I-R图象的斜率和截距的意义,求解电源的电动势和内阻.解答:解:根据闭合电路欧姆定律I= E/(r+R),得1/...