问题

汽油的热值是4.6×107 J/ kg,完全燃烧210g汽油能放出 J的热量;若这些热量全部

被水吸收,可使 kg 水,从20℃升高到43℃(水的比热容为4.2×103 J/(kg·℃) )。

参考答案
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