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第三节One possible versionPa[文]ragraph 1As the cashier put the DVD into a plastic bag, / walkeder to the younger woman. "Is that your mom? "I askedhalf[章]way expecting[来] her to tell me it was none of my businessB[自]ut she rolled her eyes and said, "Yeah. "I smiled toshow her I wasn't criticizi[知]ng.Cheris[嘛]h her, "I said. Andn I answered her curious expressio[答]n by saying, "Whenshes gone, it's the little moments like this that'llcomeack[案] to you. " It was true. I missed my mother still andrememb[网]ered the moments when I was so impatient[文] as tomake her life miserable[章]Paragraph[来] 2The elderly woman moved with her deliberat[自]e slownessb[知]ack to her daughter.[嘛] Together they made their way towardsth[答]e exit of the video store. They stood there for a momentsid[案]e bywaiting[网] for the rushing holiday current and foin it. Then the daughter glanced over andmoment[文]arily regarded her mother. And slowly, almostrel[章]uctantly,[来] she placed her arm with apparentl[自]y unaccus.t[知]omed affection[嘛] around her mother's shoulders[答] and gentlguid[案]ed her back into the deluge.
14.【解析】(1[网])在0~t时间内,[文]磁感应强度的变化率[章]为△B1B0(1分[来])△tte产生的感[自]应电动势大小E1=[知]A=△B1S_Bl[嘛]d△(1分)流过导[答]体棒ef的电流大小[案]I1=EBd(1分[网])oRto由楞次定[文]律可知流过导体棒e[章]f的电流方向为e→[来]f(1分)(2)在[自]~20时间内磁感应[知]强度的变化AB2=[嘛]2Be(1分)产生[答]的感应电动势大小E[案]≈4_△B2S2B[网]l△t△(1分)流[文]过导体棒ef的电流[章]大小1=2R=R([来]1分)该时间内导体[自]棒f产生的热量Q=[知]1R4=B2dRt[嘛]o(1分)
