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第二节书面表达De[文]ar peterGood[章] news for you. Our school is going to hold a Chinese Speech Contestwi[来]th the theme of my life in China. It will be held in our school lecture hallfrom 3 p. m. to 5 p. m. next Friday afternoon[自]. You can talk about your studyexpe[知]riences in China or something[嘛] interesti[答]ng that happened to you in ChinaSinc[案]e vou have lived in Ching Chinese for three years, why don,'t yougrasp this golden chance toHere is some advice for you. First, get well-prep[网]ared for the contest bywriting[文] your outlines.[章] Second, don' t get nervous in front of the audience.[来] Itsn't matter whether you win or lose. What matters is that you practice yourChine[自]seYours sincerely[知]Li hua
4.C【解析】无线[嘛]充电时手机接收线圈[答]部分的工作原理是电[案]磁感应,A项错误;[网]当给充电设备通以恒[文]定直流电时,充电设[章]备不会产生交变磁场[来],即不能正常充电,[自]B项错误;接收线圈[知]中交变电流的频率与[嘛]发射线圈中交变电流[答]的频率相同,C项正[案]确;被充电手机内部[网]应该有一类似金属线[文]圈的部件与手机电池[章]相连,当有交变磁场[来]时,则产生感应电动[自]势,普通手机由于没[知]有金属线圈,所以不[嘛]能够利用无线充电设[答]备进行充电,D项错[案]误。
