2019～2022高二英语周报44期答案

9B【解析】ABD.当A与B间的摩擦力未达到最大静摩擦力时,A与B以共同加速度运动由图乙可知,当F=3N时,A与B间恰好达到最大静摩擦力,此时共同加速度为1m/s21图A与精对清3当时有5N2m2m解得:m=2kg,M=1kg,=0.05。故B正确,A、D错误C.当F=6N时,A与B相对滑动,则有:umg=Mag,解得:a==m2=2m/s21m/s2,故C错误。

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

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