此矩阵借方程缩聚.This matrix is condensed by the equation.缩聚催化剂会对聚酯后加工性能产生不良影响.Polycondensation catalyst may has bad effect on polyester afterprocessing properties.用糠醇和糠醛缩聚制备了新型呋喃树脂.A novel furan resin was synthesized by polycon...
The manganate phosphating technology of camshaft is introduced.介绍凸轮轴的磷化工艺.Since 1958, an engine with a single overhead camshaft has been used.从1958年起, 便已使用带有单顶置凸轮机的发动机.The influence of inoculant addition amount on the st...