关于水的物态变化,下列说法中正确的是 [ ] A 冰雹在下落过程中表面熔化成水需要吸收热量 B 从冰箱里拿出的冰块周围出现“白气”是升华现象 C 水蒸气液化成水,分子间距离增大 D 水沸腾时温度不变,内能不变
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