有些中学因经济条件的限制,不具备磁性黑板。在细胞有丝分裂和减数分裂等教学过程中,可采用吹塑纸剪成染色体模型,根据磨擦产生静电的原理,在上课前用硬塑三角板将其磨擦产生静电。上课时由于静电的作 Some secondary schools do not have a magnetic blackboard because of the economic constraints. In cell teaching such as mitosis and meiosis, blown paper can be used to cut the chromosome model, according to the principle of friction to produce static electricity, before the class with a hard plastic triangle plate friction to produce static electricity. Due to static electricity during class