Water - borne polyurethane is the predominant material of membrane pressing adhesive.水性 聚氨酯是真空吸塑胶的主要成分.The water - borne polyurethane was based on polyester diol and toluene diisocyanate etc.以聚酯多元醇、甲苯二异氰酸酯为主要原料合成了 水性 聚氨酯...
一套完善的美语发音系统是英语基石的核心. 总共有72个语标.The American English pronunciation system, is the core part of foundations. There are 72 phonograms all together.将纸做的语标模块塑封一下,你很容易就做出一套游戏卡片.You can easily make a set of play cards by laminat...
他示范如何修补车胎刺孔.He demonstrated how to mend a puncture.设计了一种金属孔板波纹填料用刺孔机,包括上、下辊轮, 刺辊, 槽辊, 减速系统.It includes the up and down rolling wheel , thorny roller, groovy roller, reducing gears....