一本万利之道──合理下料研究与应用北方交通大学薛宝田在市场经济条件下，产品的竞争主要是产品质量与价格之争、而价格高低的关键在于材料费构成的多少，因为材料费占产品成本的比重很大，对于机械产品来说，一般约占６０％～７０％。为了降低材料费，首先要把住下料这... A Wanli Road ──Reasonable Feeding Research and Application North Jiaotong University Xue Baotian In the market economy, the main product competition is the product quality and price competition, and the price is the key to how much material costs, because the material costs The proportion of product costs a lot, for mechanical products, generally about 60% to 70%. In order to reduce the cost of materials, we must first live this material ...