短文改错This evening my father was at a grocery store, where is often crowded. A woman next to with him hadwhiclocked her keys and her baby in her vehicle. Several store clerks had tried to help her but in vain, and he did notshehave the money for a tow truck(E4). My father called a friend of his who is the tow truck driver. It wasalate in the evening and he were having dinner with his family. Therefore, he immediately agreed a drive to helpwasHowevertothe woman. My father then gave the driver twenty dollars and all ended good. The woman was quite moving andwemovednearly burst into teartears

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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