开展生动活泼的课外学习活动是培养能力、开发智力的一条很好的途径。中学课本中对于许多方面的知识只能做一些简单的介绍,比如化学中络合物介绍得很少。我在课外学习中,学到了在动物血液中存在着结合氧气的微妙的络合物,这使化学和生物学发生了联系;络合物又大量用在电镀方面,而电镀中电荷密度、电力线密度、电流等量物理方面的概 Developing a lively extra-curricular learning activity is a good way to cultivate abilities and develop intelligence. There are only a few simple introductions to the knowledge of many aspects in the middle school textbooks, such as the introduction of complexes in chemistry. In my extracurricular studies, I learned that there is a delicate complex of oxygen in the animal’s blood. This brings about the link between chemistry and biology. The complex is also used in electroplating, and the charge density in the electroplating, power line Density, current isometric physical aspects