由于化学世界中物质变化的多样性、复杂性,物质性质学习的阶段性和理论理解的有限性,学生在学习过程中认识能力的差异性,以及科学知识的不断发展和学生思维的空前活跃等因素,大大增加了化学课堂教学的随机性和 Due to the diversity and complexity of the material changes in the chemical world, the stage of the learning of the material properties and the limited understanding of the theory, the differences in students 'cognitive abilities in the learning process, as well as the continuous development of scientific knowledge and the unprecedented vitality of students' thinking Factors, greatly increased the chemistry of classroom teaching and randomness