量筒里装一半清水,用细管在水下面注入硫酸铜溶液(如图2甲所示

量筒里装一半清水,用细管在水下面注入硫酸铜溶液(如图2甲所示),静止十天后,无色清水与蓝色硫酸铜溶液之间的界面变模糊(如图2乙所示).以下判断正确的是(  

A.硫酸铜溶液的密度小于水的密度

B.此现象说明了分子不停地作无规则运动

C.整个装置处于静止状态,所以液体中的分子不具有分子动能

D.放置时间越长,分子无规则运动越剧烈

答案

B

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