中学课本中列举了NaCl、CsCl、金刚石、石墨、干冰、二氧化硅等典型晶体的结构示意图。它们的结构都是立体的 ,如何从平面图想像出三维实物的结构形态 ,这是解决有关问题的关键。首先可以利用直观结构模型 ,逐步建立起准确、清晰的立体形象 ,提高空间想像力。其次还需掌握基本 Examples of the structure of typical crystals such as NaCl, CsCl, diamond, graphite, dry ice, silica, etc. are listed in the middle school textbooks. Their structure is three-dimensional, how to imagine the three-dimensional physical structure from the floor plan, this is the key to solve the problem. Firstly, an intuitive structure model can be used to gradually establish an accurate and clear three-dimensional image and improve spatial imagination. Second, we need to grasp the basics