题目

家庭电路中电子式电能表的表盘上标有3200imp/（ ）字样。将一个电热棒单独接在家庭电路中正常工作12min，电能表指示灯闪烁了320 次，上述时间内该电热棒消耗的电能为______J， 它的额定功率为______W， 它正常工作时的电阻是________Ω. 答案：    (1).     (2).     (3). 【解析】(1)电能表指示灯闪烁了320次，消耗的电能为 (2)利用公式可算出额定功率为 (3)根据公式，可得请阅读第56-60题的电视节目内容说明和A-F六个节目名称，把它们分别配对，期中有一个为多余选项。小题1:When you need help with homework, go to the library. You may find magazines, newspapers, and big dictionaries there. They can always help you.A. Money isn’t Everything小题2:For families with children, an important problem is to get the children away from TV and let them do their homework. B. American Films小题3:Even if you could buy the world, you couldn’t buy a happy family, good friends, or knowledge.C. Farms in the future小题4:The Lost World is an exciting American film. People, especially school students, may like it.D. Study Tools小题5:People will grow plants and vegetables in the sea in about 50 years.E. Parents’ Trouble F. Children’s problem