制作石膏模型,是一项有趣的科技工艺活动,花钱不多,制作简易。下面介绍石膏模型的制作方法。一、制作材料石膏粉是洁白的粉状物质,加水后慢慢凝固。石膏粉一般分两种:一种叫模型石膏,质纯色白,浇制石膏模型光滑细洁,不留 Making gypsum models is an interesting science and technology activity that costs little and is easy to create. The following describes the production of plaster model. First, the production of material Gypsum powder is a white powder material, slowly solidified after adding water. Gypsum powder is generally divided into two types: one is called model gypsum, solid pure white, pouring gypsum model smooth and clean, do not leave