求解初三物理题 有关比热容和热值的用煤气将15KG,初温20度的水加热100度,煤气热值42000000J 煤气烧水时热效率20%求烧开这些水需要的煤气;同条件下,煤气节省0.04KG ,现在的煤气灶热效率
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![求解初三物理题 有关比热容和热值的用煤气将15KG,初温20度的水加热100度,煤气热值42000000J 煤气烧水时热效率20%求烧开这些水需要的煤气;同条件下,煤气节省0.04KG ,现在的煤气灶热效率](/uploads/image/z/5583-39-3.jpg?t=%E6%B1%82%E8%A7%A3%E5%88%9D%E4%B8%89%E7%89%A9%E7%90%86%E9%A2%98+%E6%9C%89%E5%85%B3%E6%AF%94%E7%83%AD%E5%AE%B9%E5%92%8C%E7%83%AD%E5%80%BC%E7%9A%84%E7%94%A8%E7%85%A4%E6%B0%94%E5%B0%8615KG%EF%BC%8C%E5%88%9D%E6%B8%A920%E5%BA%A6%E7%9A%84%E6%B0%B4%E5%8A%A0%E7%83%AD100%E5%BA%A6%EF%BC%8C%E7%85%A4%E6%B0%94%E7%83%AD%E5%80%BC42000000J+%E7%85%A4%E6%B0%94%E7%83%A7%E6%B0%B4%E6%97%B6%E7%83%AD%E6%95%88%E7%8E%8720%25%E6%B1%82%E7%83%A7%E5%BC%80%E8%BF%99%E4%BA%9B%E6%B0%B4%E9%9C%80%E8%A6%81%E7%9A%84%E7%85%A4%E6%B0%94%EF%BC%9B%E5%90%8C%E6%9D%A1%E4%BB%B6%E4%B8%8B%EF%BC%8C%E7%85%A4%E6%B0%94%E8%8A%82%E7%9C%810.04KG+%EF%BC%8C%E7%8E%B0%E5%9C%A8%E7%9A%84%E7%85%A4%E6%B0%94%E7%81%B6%E7%83%AD%E6%95%88%E7%8E%87)
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