问题描述：
SAT2物理水的热胀冷缩问题
书上写：”as a lake is cooled at the surface by the atmosphere,the bottom of the lake tends to reach and maintain a temperature of 4°C“
为什么?
书上写：”as a lake is cooled at the surface by the atmosphere,the bottom of the lake tends to reach and maintain a temperature of 4°C“
为什么?
问题解答：
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