高二课标英语周报2022-2022第20期答案

短文改错Ever since I was a child, I have been dreaming of travelling A China. One of my goal was to learnChinese. I decided to follow an one- week course for some basic skills in Shanghai. In general, I should have hadgoalgroup lessons, but I got 30 hours of privately lessons since I was the only beginner that week! This helped me soprivatemany. Have a teacher all to me improved my study a lotmuch Havingbut I still had a long way to go. Though thegrammar was quite easy, the pronounce was extremely hard. My teacher was a"master of tea", she hadpronunciationstudied the art of tea-making. So every day she bring a different kind of Chinese tea to me!who书面表达rought

1.(8分(1)-+(2分)(2如图所示,2/m(2分)(3)9.7或9.8(2分)(4)能(1分)(5)使第一、第二光电门间距离大些,钢球体积3,4尽可能小等(1分)3.23.0【解析】(1)一是时间t内的平均逸度,也是该2.8段中间时刻的速度故有=十g2.62)如图所示2.42.2△((3)加速度g=2k=24n-9.7m/s22.018(4)如果保持第二个光电门不动,设小球下落到第二光电门的时间为T则有1.61.42g1-21.200.51.01.52.02.53.03.54.04.55.0t/×10s整理得:=g-g或者,设小球在第二光电门的速度为,根据运动可逆有了=边-2g设该方程的斜率为k,则g=一2k.故该法能求重力加速度(5)为了减小误差,可以使第一、第二光电门间距离大些,钢球体积尽可能小等

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