英语周报新课程2022高二第49期答案

第二节书面表达(满分25分)One possible versionDear lucy,I am Li Hua, chairman of the Students'Union. I am writing here to extend our sinceregratitude to youDuring the COVID-19 pandemic last year, you were trapped in your country and couldntreturn to our school. However, it was lucky that you used the Internet to give lessons. All thestudents said that you put your heart into making the lessons interesting. As a consequence,though you were still in England, we had no trouble in continuing new lessons this term, whichmade us so proud of being taught by youLooking forward to your early returnLi Hua

20〔爸猴⑨AC什么O命题人考查理想变压器、交变电压的有效值、电功率等知识,旨在考查考生的理解能力这么考Q由图甲可知原线圈输入电压的周期T=2×102s,则输入电压的频率为=T=50H,由于变压器不改变电压的频率则副线圈输出电压的频率也为50Hz,A项正确;由图甲可知,原线圈输入电压的最大值为3lV,则有效值为3以V=220V,根据=可得副线圆输出电压的有效值为U2=22V,B项错误;根据n=n可知,当P向左移动时,原、副线圈的匝数比不变,则原副线圈的电流比不变,C项正确;当P向左移动时,滑动变阻器接入电路的电阻变大,副线圈中电流变小,副线圈两端电压不变,根据P=U可知,变压器的输出功率减小,D项错误。怎么解●(1)解决变压器的基本关系式有:②电压关系:=n;有多个副线圈,票①功率关系:P=P出U203(2)解决理想变压器动态变化的思路U2U决定R页P=尸2(1=h2U2)P1=决定决定决定P

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