2022英语周报高三（HG ）答案

第三部分写作第一节One possible versionDear ericHow are you doing? I'm writing the email to tell you somegood news in our school. Our schools Paper-cutting Club islooking for new members. Its goal is to promote the culture of thepaper-cutting and make our school life colorfulI know you like paper-cutting and you're expert at itTherefore, I'd like to invite you to join the club. But you'rerequired to send your information to the club bcforc Junc 29thYour early reply is highly appreciatedYours sincerelyLi Hua第二节

3.B解析:原、,副线圈中电流之比=生=1,由于R1=4R,则两个定值电阻消耗的电功率之比P=1RR1,A项错误;电阻R2两端的电压等于副线圈两端的电压,即U2=h2R2,原、副线圈两端的电压之比=,则U1=42,电阻R两端的电压U1′=1R1=4,4R2=12R2=U2,所以电源两端的电压U=U1+Un?=5U2,因此,电阻R2两端的电压等于电源电压的÷,B项正确;电源的输出功率P出=Ul1,电阻R1消耗的电功率P=1=5电阻R消耗的电功率与电源输出功率之比=吉,C项错误:电阻R2消耗的电功率P2=(2l2=,41=4U1,电阻R2消耗的电功率与电源输出功率之比P=4,D项错误。出

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