英语周报高考13期2022－2022xn答案

12.【答案】(1)3.60(1分)(2)100(2分)(3)9.0(2分)20002分)10002分)【解析】(1)电流表读数为3.60mA。(2)由图甲知毫安电流表的最大量程为5mA,改装后的电压表内阻为R,==5。510009。(3)多用电表挡位调到电阻”×100档,调零后,根据其原理得内阻等于其中值电阻,R内=2000设图乙中进行c步操作时滑到变阻器连入电路中的电阻为R,多用电表内电池的电动势为E,由闭合电路欧姆定律有E=1(RA+R+R,)、E=B(Rn+R、),解得E=9.00V,R=1000

(注意:短文中共有10处错误,在答题规范的情况下,找到一处错误并修改正确得1分:若找到一处错误但没有改对得0.5分。)In recent years, the sandstorm in the northem part of China has become/ more and morecommon natural disaster. The strong wind blows up some sand, making them difficult foItpeople to go out Sandstorms are caused by a variety of reason. Frst, in the past people feed areasonsgreat number of sheep. As a result the sheep ate so many grass that the land tuned intomuchdeserts. Second, people were not concerming about protecting forests, and cut down manyconcernedtrees. that caused the loss of soil when it comes to improve the situation, the governmentwhichImproving.starts to stress at the importance of the environment. I believe final the problem will be solvedfinally+in the near future.

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