英语周报八下27，2019一2022答案

书面表达Dear Sir or MadamI am Li Hus, an exchenge student from China. Wanting to get a library card in your library.(背景2分)1 am writing to ask for some relvant information.(目的3分)to begin with, could you please tell me what kind of books can beborrowed?(要点一6分) besides, I would be very interested to ksomething about borrowing system, including how long I can keep thebooks, how many books I can borrow once, and how much I should pay(要点二6分)L8 t but not least, I also wonder when and where I canmake it.(要点三6分)a中aThanks for your ime and I would appreciate it if you can give an earlreply.(表感谢+期回复2分)1量里的0+Yoour sincere.yLi H点国惊口人国文

p.(1)开关未断开(2分)多用电表正负极接反(2分)9(2分)1.2(2分)分压(2分)=(2分)>(2分)【解析】(1)图中在器材连接或操作上存在的两个不妥之处:开关未断开;多用电表正负极接反。(2)根据闭合电路欧姆定律得E=IR+Ir,则R=了E一r,可知图线斜率表示电动势,纵轴截距的绝对值表示内阻,则E=6+1.V≈2.9V,内阻r2.5=1.2a。(3)将多用电表的内阻等效到电源的内部,则有R=1E-(+RA),则可知测量的内阻等于电源的实际内阻与多用电表的内阻之和,测量值偏大;而电流表内阻对图象的斜率没有影响,故电动势准确

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