正确使用托盘天平称物体质量是初中物理的基本实验之一,也常是中考的热点.近年来,中考试卷中用因操作失误导致称量值偏差的题目来考查学生对天平问题实质性的理解及分析能力,学生普遍感到有难度、没把握.现简要举例加以剖析. It is one of the basic experiments of junior high school physics to correctly use the balance of objects. It is also often a hot spot of the middle school entrance examination. In recent years, the students in the middle school examination paper have used the problems caused by operational errors to cause the deviation of the weighing value to examine the substantial understanding of the problems of the balance. With analytical skills, students generally feel that they have difficulty and are not sure.