短文改错A professor gave a balloon to every student, whom had to write their name on it or throw it in thewhoandhallway. The professor then mixed all the balloon, The students were given 5 minutes to find their ownballoonsballoon.Despite of a busy search, no one found their balloon. At that point the professor told the students totaking the first balloon that they found and hand it to A person whose name was written on it. SurprisingtaketheSurprisinglyeveryone had their own balloon soon. Thehe professor said to the students: "These balloons is like happiness.areWe would never find it if everyone is looking for their own. But if we care about other people,'s happinessllwe'll find our too."ours

25.解:(1)粒子的运动轨迹如图所示,设粒子在磁场中做匀速圆周运动的半径为r,有quB=my(2分)由几何关系有r2=dF+(r-yd)2(2分)解得B=5".(2分)(2)由几何关系有OD=tan-34(2分)设粒子在电场中做类平抛运动的加速度大小为a、时间为t,有gE=m(2分)ODos=w(2分)ODin 6=at2(2分)解得E-25m.(1分)

以上就是2018-2022 英语周报 八年级 GDY 30答案，更多英语周报答案请关注本网站。

本文地址： http://www.ncneedu.cn/post/6207.html

文章来源：admin

版权声明：除非特别标注，否则均为本站原创文章，转载时请以链接形式注明文章出处。