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3.如书与较差影呵父怀,降低一个档饮什分。【参考范文】But one day,I came home and heard five beautiful words,"Jessica,you have one letter."I opened iteagerly to find a check for 50.Someone really cared!Amazingly,for the next few days more letters with acheck kept coming and I ended up with enough money for the Forum.My family and friends all felt happy forme though they were a little embarrassed about the judgment they had made about the money.Finally,I wasable to attend the Forum and gained a lot of knowledge about medicine.I have learned two important lessons from this experience.First,it lets me see that there is still kindnessin the world,and I must pass it on to make our world full of love and care.Then the other lesson is aboutsticking to a dream.Anything is possible if you make up your mind to achieve it and never give up,no matterwhat others say about it.I have many other dreams,and now I have reasons to believe that they will lead toeven greater success in my life.
9.AD【解析】本题考查电容器,目的是考查学生的推理能力。该过程中,电容器的电荷量Q不变,由Q=CU、【高三物理·参考答案第1页(共4页)】1003CErS(矿)和U=E(d+x)可得E-餐,因此E与A板的位移大小x无关,选项A正确:由C=erS4πk(十)可知,当x增大时,C减小,但C随x变化的关系图像不是一次函数图像,选项B错误;由于B板接地,且P点到B板的距离d'不变,因此P点的电势9=一Ed与x无关,但为负值,选项C错误;对A板,根据动能定理有W一F1x=0,其中电场力F1恒定,解得W=Fx,因此W与x成正比,选项D正确。