I'v learned a lot of English in this w .

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• 修改文章语法错误I am Chinese. I am proud of being a Chinese with five thousand years of civilization behind. I've learned about the four great inventions made by our forefathers. I've learned about the Great Wall and the Yangtze River. I've learned about Zhang Heng(张衡)and I've learned about Zheng He(郑和)．Who says the Yellow River Civilization has vanished(消失)?I know that my ancestors have made miracles(奇迹)on this fertile land and we're still making miracles. W
• 几道电功率,1.一标有2.5V 0.3A字样的灯泡L和最大电阻为20欧的滑动变阻器R串联,接到电压为U的电源上,下列错误的是A.若U=2.5V,无论怎么样移动滑片P,电路的总功率均不会超过0.75WB.若U＞2.5V,且不损坏灯泡和变阻器,无论怎么样移动滑片P,电路的总功率一定大于0.75WC.当滑片P移动至某个位置时,L和R的电功率可以相等D.若U＜2.5V,无论怎么样移动滑片P,L均不能正常发亮.2.一电动机线圈的电阻为1欧姆,线圈两端所加的电压为2V时,电流为0.8A,电动机正常工作.(1）在求电动机正常工作1分钟所消耗的电能时,有以下两种不同的解法小明解：W=UIt=2V×0.8A×60s=96J小华解：W=I²Rt=（0.8A）²×1Ω×60s=38.4J你认为哪位同学对,做出判断并说明理由（2）求电动机正常工作1分钟所转化的机械能同学，好歹我打了那么多，你的回答真简略
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