2018-2022 英语周报 八年级 GZ 31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

23(1)O如图所示(2分)S充电宝②a(1分)⊙5000500也可给分)(1分)串(1分)4.5(1分)(214.9(2分)1.9(2分)【解析】本题考查闭合电路的欧姆定律,目的是考查学生的实验能力。(1)②为保证电路的安全在接通开关S1前滑动变阻器R的滑片应置于a端⊙电压表y的内阻远大于变阻器R的最大阻值故断开开关S2后电压表①与电阻箱的总电压几乎为450mV,当电压表的示数为300mV时电阻箱R两端的电压为450mV300mV=150mV,有Rv2500解得R=50000(④电压表大量程时需要串联电阻有0.45V4.5V-045V,解得R=5k0。(2)经分析可知(用+)=E)整理得=+8)RvE结合题图了有R+R0v(r+R3)Ry+R6+B2049V解得E=49V、m=190。(m=20Q也可给分)

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