英语周报八年级新目标第一期2020―2021答案

12.(1)如图所示(3分)(2)2.95(2.94~2.96,2分)0.50(0.49~0.51,2分(1)【(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=0.450,由闭合电路欧姆定律得E=U (1 m)(RA r),Ir则有U=E-(I 2)(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)=0.950,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。

据前面的内容可知,作者认为自已已经(alcd矩文改sA2.thie6xwho64.wthd6s.too6.bony67.abTomb sweeping Day one of the most important Chinese traditional festival. According to ancientres A forbidden on that day and people had to cat cold food withour lighting a fireThere are several activities people do during the festival. Planting trees is a good one. Every year, muchmanywereces are planted all over China. Another popular activity is spring outing, which is a good chance to do exercise.The wether is warmly and it is pleasant to walk in the fields in the. springEvery year.inelebrate of the festival, our school organizedganizes the students to climb mountains. We alwayscelebrationng English. It

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