2022-2022英语周报八年级（BSJ)41期答案

第三节书面表达wersionDear Sir or MadamMy name is Li Hua. As an exchange student fromChina, I am studying in a local school. I am reallydelighted to learn that a volunteer for your Chinese culturallic exhibition is required and I'm confident that I amtruly fit for thestart with, my advantage first lies in the fact that IChina and used to beand quite familiar with Chinese relics. Further-more, being an outgoing and optimistic boy, I am good atcommunicating with others and introducing Chinese cultureto the world is always my honor and my pleasure. Finallythere is no problem with my spoken English, as I havelived here for almost a year and I have no difficulty commu-dicating with others in EnglishI would really appreciate it if you can offer me thechance to be a volunteer in your museum. I am looking forward to your early reply.Li Hua

10.AD【解析】在整个运动过程中,系统受到的合外力为零,系统的总动量守恒,小球a与小球b碰撞过程机械能减小,故A项正确,B项错误;小球a、b碰撞瞬间,弹簧仍处于原长,对小球c无影响,小球c的速度为零C项错误;小球a与小球b,碰撞后,弹簧被压缩弹簧对小球b产生向左的弹力,对小球c产生向右的弹力,小球a、b做减速运动,小球c做加速运动,当小球b、c速度相等时,弹簧压缩量最大,弹性势能最大,故D项正确。

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