2022七年级下册英语周报答案仁爱版

12.ACD【解析】金属棒ab做切割磁感线运动,则有E=Bu,I=b,F安=BI,当金属棒ab的速度最大时有mgin=F安,联立解得m=0.12kg,A项正确;当p=2.2s时,v1=9m/s,此时F安1R0.648N, mosin-F安1=ma,解得a=0.6m/s32,B项错误;当t=1.6s时,v2=8m/s,此时E2=Blv2=9.6V,电阻R中的电流大小为l1≈E2=0.48A,CR项正确;电荷量q=I=<9A≈,代人数据解△tR得q=0.48C,D项正确。

Possible version:Tom thought for a moment and was about to agree, but he changed his mind. " I can't, BenYou know Aunt Polly wants the fence to be perfect. It has to be done very carefully.I don'tthink you can do it well enough. "He said to Ben, who looked a little discouraged. "Oh, Tom, I'llbe careful. Please let me have a try I would like to give you my apple if you agree, "requestedBen In the end, Tom gave up the brush with unwillingness on his face, but joy in his heartWhile ben worked at the fence in the hot sun Tom sat under a tree, eating the apple, andlanning how to get more help. many of his other friends walked past him. Each one came topllaugh, but remained to whitewash the fence because they all got interested in it. One by one, theywhitewashed the fence, each giving Tom a reward, big or small. If he hadn't run out ofwhitewash, Tom would have owned everything belonging to his friends. He had a most wonderful andidle Saturday, sitting in the shade and enjoying the rewards that his friends gave him

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