2022英语周报GQY第十七答案

5.C【解析】由交流电瞬时值表达式w=1100√2sin200t(V)可得交流电的频率为10HzP电压有效值为U2=1100V,输电线上的电流I==80A,故A项错误;降压变压器的输入电压U3=U2-Ir=700V,降压变压器原副线圈匝数比n3=70035220;11故B项错误;用电器的额定功率P=Po.6×104W,故C项正确;变压器不改变交流电的频率,所以用电器上的交流电的频率为100Hz,故D项错误。

第一节One possible versionDear Ms JenkinsI'm writing to ask you for help. Our school is going to sponsor an exhibition of Chinese paintings in theschool library next month. As president of the student council, i have been assigned the job of drafting an arnouncement in English as there aredreds of international students in our schoohave already written a rough draft of the above-mentioned announcement. But I'm afraid that there aresome mistakes in the English language. So I am hoping you would correct my possible mistakes in the announce-ment that i have attachedId appreciate it if you could do me the favocerely yourLIH

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