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高花亭小学
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Dec 5, 2006, 9:08:10 PM
12/5/06
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to 自由空间〔高花亭小学信息技术论坛〕
路程=速度*时间 s=vt
速度=路程/时间 v=s/t 时间=路程/速度 t=s/v
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