试题与答案

靠近刚刚烧开水的水壶仔细观察,会看到从壶盖小孔中冒出一缕“气”.为什么这缕“气”

题型:问答题

题目:

靠近刚刚烧开水的水壶仔细观察,会看到从壶盖小孔中冒出一缕“气”.为什么这缕“气”要升到相距小孔一定距离的地方才能看到?

答案:

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