初二上学期英语周报人教版2022-2022第三期答案

第四部分写作第一节毒作提示1.一审:确定写作体裁和主题(1)体裁:应用文;(2)主题:介绍香肠的有关知识2.二定:确定时态和人称(1)时态:以一般现在时为主,一般将来时为辅;(2)人称;以第一、三人称为主3.二明确:明确写作要点(1)开头:点明主题,向外教kohn介绍他感兴趣的当地美食产品—一香肠;(2)中间:重点介绍香肠的烹饪方法;(3)结尾:送给他香肠,希望他喜欢。参考范文Dear JohnI am more than happy to know that you are interested in our localfood-Chinese sausage. Whenever one smells sausage, he will find ithard to resist the tempting call of taking it homeChinese sausage can be cooked in numerous ways. Boiling is oneof the easiest ways, which may take up to 30 minutes. You might aswell try stir-frying sausage in slices. Sometimes, many people wouldlike to bake sausage in the oven in order to make it crispyI have specially prepared some for you. I do hope you will like itYours.Li Hua

3(爸暴⑨(1)如图所示(2分)(2)1.48(2分)0.84(0.70~0.90之间均可,2分)R1(3)<(2分)<(2分)R3考什么@命题人考查测量电源电动势和内阻E的实验,旨在考查考生的实验能力。这么考(1)一节于电池的电动势约为1.5V,电压表V量程合适结合伏安法测电阻,为方便实验操作,滑动变阻器应选R1,阻值范围是0-1092,则电路中最小电流约为lm=R=0.15A,电流表A的量程是3A,被测电流值与电流表量程相比差距太大,因此不能用电流表A而选用电流表G与定值电阻R3并联充当电流表,由于电压表内阻较大,所以电路图如答图所示。(2)由上分析可知,改装后电流表的量程是电流表G量程的200倍,结合闭合电路的欧姆定律可得UE-200/,由图可知电源的电动势E=1.48V,由数学知识知kN△I2=2007,则电源内阻为r=0.849。(3)由于电压表的分流作用,使电流表示数偏小,因此电动势和内阻的测量值均小于真实值

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