第四部分写作第一节短文改错There is an old saying that "Nothing is impossible fora willing heart". It means that you can overcome anydifficulty but succeed if you try your best.andWhen I was in middle school, I had great difficultidiin learning maths. Then I always think that maths wastoo difficult that I seldom studied it seriou sly. Thanks tothoughtmy headteacher, I devoted myself toIt.studypreviewed my lessons careful before class, listenedstudyingattentively in class and turned A my teacher when I had acarefullyquestion after class. Finally, I made 4 rapid progress.Therefore, impress you with the old sayingyourselfwhenever you come about challengesacross

24.(1)带电微粒在第I象限的匀强电场中由静止开始加速,由动能定理,有:2E·2a=my(2分)faeid解得(2分)(2)由图乙中轨迹可知微粒在第Ⅱ象限的匀强磁场中刚好运动了半周,有:,,4',,4qB=mR(1分),,:实2rR(1分)节2,”·,、,!:,n:,,…4=2(分)由几何关系有R=3d(1分)联立解得:B=3m(2分),:30d4-√四(2分)

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