12BCD【解析】对金属棒a、b分别由动量定理得一BI2dt=2my-2mvo,Bldt=mu′,联立解得mvo-mv=mv′.两金属棒最后匀速运动,回路中电流为0,B2d=B',即v=2,则、y,130,A错误;在金属棒b加速运动的过程中,有BIdt=mv,即Bgd=n X3v,解得q3BdB正确;根据法拉第电磁感应定律可得g=14/≈ER4△φBX△S3R3R"·解得eRmu△SC正确;由能量守恒知.回路产生的焦耳热2mv2一-×2mm“三nUo则金属棒a产生的焦耳热Q′≈2bmv,D正确。故选BCD。

第二节【写作指导】本文是一篇记叙文,讲述一对双胞胎在母亲节那夭为妈妈做早餐的故事。已給文段的段落大意如下:第一段:双胞胎计划在母亲节那天給妈妈一个惊喜,为她做早餐。第二段:母亲节这一天,双胞胎来到厨房,煮粥,做吐司。第三段:粥煮沸溢了出来,把火浇灭了,灶台乱糟糟的,Jf的手烫着了,面包片炸糊了。读后续写的写作中,我们应该注意下面几个写作原则:1.主題必須是积极向上的,问題得到解决,矛盾冲突得到化解,皆大欢喜。2.两大主线:1)故事的发展线索;:2)主人公情感变化的线索。3.四句定乾坤:1)根据给出的续写第一段的首句,确定续写笫一段第二句的内容;2)根据续写第二段的首句确定续写第一段的最后一句,以保证两段之间的平稳过渡;3)根据给出的续写第二段首匈确定续写第二段第二句的内容;4)确定文章最后一句,给故事一个完美的结局。续写两段内容续写第一段首句:当双胞胎失望地环顾四周时,他们的爸爸出现了续写郜分:看到眼前的情景,爸爸安慰孩子,并帮他们收拾、做早饭最后,早饭傲好了,双胞胎很高兴。续写第二段首句:双肥胎瑞着早餐上楼,喊醒妈妈。续写部分:妈妈醒来,看兒早餐,感到十分惊喜;爸爸出現,告诉妈妈所发生的事情;孩子长大了,妈妈为此感到高兴与自豪。【范文赏读】As the mucins Looked around them in disappointment, their fatherappeared. Seeing the mess in the kitchen(现在分词作伴随状语),hemediately understood what had happened(宾语从句), but he wasnupset. Instead, he applied some medicine to Jeffs hand, and then set out tohelp them clean up the mess, throwing away the burnt toast. Next, theybegan to make breakfast, and by now the twins looked cheerful. Before longthe porridge was ready. Their father instructed them to fry the rest of thebread. Soon, the breakfast was ready, too.The twins carried the breakfast upstairs andtheir mother up.Openingshe couldnt believe what she hadBefore she couldisk any question, their father turned up and told his wife about how thetwins had made preparations to give her the surprise breakfast( about a第一个宾语从句), and what trouble they had gone through whenmaking the porridge and toast( about的第二个宾语从句,其中whenmaking相当于 when they were making), Disbelief gave way to excitementand pride. Hugging them in her arms, she said, "Thank you, children, It'ssuch an unforgettable Mothers Day for me.

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