2022九年级英语周报1期:答案

11.AB【关键能力】本题考查变压器的工作原理,意在考查考生的模型建构能力和逻辑推理能力【解题思路】输入端电压的有效值为30V,当a、b间接一电阻不计的导线时,电压表的读数为,=n2Uⅹ30V=15V,A正确;当a、b间接一电阻不计的导线时,若将电流表换成阻值为5g、额定电流为1A的灯泡,副线圈的电流为/2R,+1A,则灯泡能够正常发光,B正确;当在a、b间接一阻值为10g2的定值电阻时,设电流表的示数为1,则此时原线圈中的电流为0.5/,原线圈两端电压U=(30-5/)V,则翮线圈两端电压为U"2=-(30-5/)V,又U2=10V,解得/=1.2A,C错误;当在a、b间接额定电压为5V、阻值为8Ω的灯泡时,设电流表的示数为r,同理可解得r=1.25A,副线圈的输出电压CrR=12.5V,由变压器的工作原理可知变压器原线圈的输入电压为25ⅴ,所以a、b中间所接灯泡两端的电压为5V,灯泡能正常发光,D错误

书面表达:命题立意:本题要求考生给留学生朋友 Steven写一封邮件,帮助他预订中国餐馆。该情境基于考生实际生活,并融入了英语元素。该题很好地体现了英语的交际性,有利于考查考生的英语实际应用能力。参考范文:Dear StevenIm glad to know your birthday is coming and I want to give you my sincere wishes and express"Happybirthday to youIn order to have a great birthday, it's necessary for you to find a suitable restaurant. Now, let me share onewith you. There is a good restaurant near the city library, the price of which is cheaper compared with manyother Chinese restaurants. More importantly, the dishes of it such as fish, beef and seasonal vegetables are verygood. Some of my friends think they are delicious after eating there. Because there are many guests going to therestaurant, I suggest you book it in advance. I hope my suggestions will be helpful to you.Yours

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