物体物态的变化或物体在液体中浮沉状态的改变都有可能引起液面的变化,而这类问题由于涉及的知识点较多,综合性很强且运算也相对较复杂,所以学生很难熟练掌握。从全国各地的中考试题分析来看,这类问题时常涉及。它能有效地考查学生对以下几方面知识的理解和掌握的程度:一是质量和密 Changes in object state or object in the liquid floating state changes are likely to cause changes in the liquid level, and such issues because of the knowledge involved more points, comprehensive and relatively complex computing, so students difficult Proficiency From all over the country in the examination questions analysis, such issues are often involved. It can effectively examine students’ understanding and mastery of the following aspects of knowledge: First, the quality and density