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研究所内举办了小规模的壳型铸造展览会,主要内容有:1．壳型铸造简介及其优越性;2．树脂及其代用品20余种并介绍了其产地和价格;3．树脂砂混合料十余种,并介
Institute held a small shell casting exhibition, the main contents are: 1. Introduction and superiority of shell casting; 2. More than 20 kinds of resins and their substitutes and their origin and price; 3. Resin sand mixture of more than 10 species, and mediated