纵观近几年来各地中考物理试题,发现中考压轴题大多数是有关液体压强和浮力相结合的计算,而液面高度的变化和 V_排(ΔV_排)结合型试题又是考试的重点.这类问题涉及的知识点多,综合性较强,对初中学生来说,确实是个难点,学生往往无从下手,故在此举两例解析如下. Looking at the physics examination questions in various local examinations in recent years, it was found that most of the final exam topics in the exam are related to the combination of liquid pressure and buoyancy, and the changes in the liquid level and the combined questions of V_row (ΔV_row) are the focus of the exam. This kind of problem involves many knowledge points and is of a comprehensive nature. It is indeed a difficult point for junior high school students. Students are often unable to start. Therefore, two examples of this problem are explained below.