完全燃烧42g焦炭所放出的热量,若有50%被2kg、30℃的水吸收,则水温可升高()(c水=4.2×

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完全燃烧42g焦炭所放出的热量,若有50%被2kg、30℃的水吸收,则水温可升高()(c水=4.2×
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