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有关“液面升降”的浮力综合题,是历年中考的压轴题。这类试题既是对考生所学知识掌握程度的综合检阅,又是对考生能力的综合检查。因此,许多教师在进入总复习阶段时,都要针对此类习题进行重点训练,但从中考考试成绩来看,却收效甚微,究其原因,主要是“液面升降”过程复杂、抽象,教师很难讲清,学生很难理解,因而失分率高。那么对此类习题的分析、求解是否就束手无策呢? 本文就2002年天津市和福州市两例有关
The buoyancy-comprehensive questions about “liquid lifting” are the final questions in the Chinese exams over the years. Such questions are not only a comprehensive review of the mastery of the students’ knowledge, but also a comprehensive examination of their ability. Therefore, many teachers must focus on such exercises when entering the general review stage. However, from the perspective of the examination results, they have had little success. The main reason is that the process of “liquid lifting and lowering” is complicated. Abstraction is difficult for teachers to explain clearly, students are difficult to understand, and thus the score is high. So is the analysis and the solution to this type of exercise problemless? This article on the two cases of Tianjin and Fuzhou in 2002