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中学物理教学中的正负号银川师范陈健民中学物理中的一些物理量或物理公式，常带有数学符号“＋”、“—”号。正是这正负号，简洁准确地表示出这些物理量或物理公式的意义或特征。教学实践说明，在教学中使学生正确运用正负号，既是理解物理概念和规律的基础，也是应用物...
The sign in the middle school physics teaching Some physical quantities or physics formulae in Yinchuan Normal University Chen Jianmin’s middle school physics often carry the mathematical signs “+” and “-”. It is this sign that simply and accurately represents the meaning or characteristics of these physical quantities or physical formulas. The teaching practice shows that the correct use of positive and negative signs in teaching is not only the basis for understanding the concepts and laws of physics, but also the application...