题目

（10分）有一只小灯泡上标有“12V 6W”的字样，现在要用伏安法测量这只灯炮的U-I图线。现有下列器材供选用：      A．电压表（0~6V，内阻约10k）      B．电压表（0~15V，内阻约为25k）      C．电流表（0~0.3A，内阻约2）      D．电流表（0~0。6A，内阻约1）      E．滑动变阻器（10，3A）      F．电源（电动势为15V，内阻较小）      G．开关、导线   （1）实验中所用电压表应选     ，电流表应选用    （用序号字母表示）   （2）为There was once a bad king, all his people hated him very much. One day in a summer he was swimming by himself in a river.The king was a good swimmer, but while he was in the middle of the river, he was ill. He cried out “Help! Help!” At that time two farmers were working in the field near the river. They ran over, jumped into the water and saved the king. They didn’t know that he was the king until they pulled him out of the water.The king was very happy, so he said to the farmers, “You have saved my life. Now you may ask for anything, and I’ll give it to you.”One of the farmers said, “My son broke his leg last week, and he can’t walk. Please send him a good doctor.” The king agreed. Then he said to the other farmer. “And what can I do for you, old man?” The old man was very clever. He thought for a few minutes and then he answered, “You can do a very important thing for me.”“What’s that?” asked the king. He thought that the old man would ask for some money or something else.“Don’t tell anybody that we have saved you,” the old farmer answered. 【小题1】 Where was the king swimming one day in a summer?A. In a river.B. In a lakeC. In the sea【小题2】Who came to save him?A. His son.B. Two farmers. C. A farmer.【小题3】When did the farmers know that he was the king?A. Before they jumped into the water.B. When they were in the water.C. After they pulled him out of the water.【小题4】What did the king do after he was saved?A. He promised to be a good kingB. He promised to give the farmers anything they wantedC. He promised not to swim again.【小题5】Why did the king need help in the water?A. Because he wasn’t good at swimmingB. Because somebody pulled him into the water.C. Because he was ill.