2022九年级英语周报第2答案

局二一轮复习·新咼考第二节One possible versionDear Sir/madamI' m writing to complain about a Kindle that I pur-chased from your website on May i stAfter one week of its purchase, I found it didnt workas expected. The battery didn't last long after beingrecharged, perhaps merely half a day. Worse than that, thewords on the screen were not distinct enough, which i thinkis damaging to my eyesighthave been a devoted customer of your company and: Ihope you will look into the matter seriously and replace thefaulty Kindle with a new one as guaranteed. Thank youYours sincerelyLi Hua

此时细线Oa上的拉力T=2mg9s30°=3mg,A项正确。5.A【解析】对两个小球整体进行受力分析,如图所示,由图解法可知当F与细线Oa垂直时,F有最小值。

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