在近几年各地的中考试卷中,有一类涉及液面升降的中考压轴题经常让学生望而却步,无从下手,不知所措,这类题目综合运用质量、密度、力、二力平衡、压强、浮力等知识,综合性强,对学生的分析能力及思维能力的要求很高,大多数学生对此非常头疼和害怕。一些参考资料及试卷提供的标准答案很繁琐并 In the mid-term examination papers in various places in recent years, there are one type of questions in the middle of examinations that involve the lifting and lowering of the liquid level. This often makes the students prohibitive, and they have no way of knowing what to do. They use quality, density, force, balance, pressure and buoyancy. Such as knowledge, comprehensive, students’ analytical ability and thinking ability are very demanding, most students are very headache and fear. Some reference materials and the standard answers provided by the test papers are tedious and