英语周报2022-2022学年高二上学期课标XB第11期答案

第二节书面表达One possible versionDear Jonah,How are you? I m writing to share my favorite bookwith you. My favorite book is called How to improve englishwriting. The color of its cover is white and yellow. It has126 pages. It's a birthday gift from my sisterLast term I did poorly in an important English testOne of the big reasons was that I got few marks in the writ-ing part. I was very upset. My sister sent me this book andencouraged me to improve my writing. From then on, Ispent more time in writing. Thanks to the book, I haveYoursmade great progress in writing. I love this bookLi huaBest wishes

12.(1)如图所示(2分)RKAImEGrmmmmmmhe31(2)2.95(2.94~2.96,2分)0.50(0.49~0.51,2分)(3)没有(2分)【解析】(1)电路图如图所示。(2)改装后电流表的量程为1A,内阻RA=0.459,由闭合电路欧姆定律得E=U+(Ⅰ+B)(RA+n),则有U=E-(I+b)(RA+r),故U-I图象与纵轴的交点为两节干电池的总电动势,E=2.95V,斜率的绝对值等于10(RA+r),故(RA+r)=0.959,解得r=0.50Ω。(3)当电流表的示数为0时,外电压等于两节干电池的总电动势,故电动势没有系统误差,所以电流表的内阻对两节干电池总电动势的测量结果没有影响。

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