2022英语周报 七年级牛津答案

19.【答案lACD、解析】对滑块受力分析,上滑时 mysin B+ng6=ma1,下滑时mgsn- pagos=ma,代入数据求得=37°,J=0.4.A项正确、B项错误;滑块先以a1=9.2m/42加速度沿斜面向上匀减速运动,1s宋,滑块以a:=2.8m的加速度反向匀加速运动,2N末滑块到斜而底部的距离△=5a,2-a=×9.2x2m-x2.8x12m=3.2m,C项正确;由。=,可求得滑块初速度t=9.2m/s,D项正确。

第二节One possible versionniceDear overseas students from America,Here comes the news that Chinese Bridge series activities will be held in our school. So all of participants arewarmly welcome in the pep rally to get fully prepared for thefolloThemed at promoting Chinese culture around theworld, Chinese Bridge acts as a platform to help narrow thegap of mutual understanding about China. Whoever isactively involved in it will develop a positive awareness ofChinese and its culture behind. Based on it, the pep rallis scheduled in our school auditorium from 14: 00 p.m15: 00 P. m. next Friday afternoonPlease make sure you are available at that time andThe student’ s Union

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