预涂层可以是任何常用的刚性成膜剂.Primers may be any of the common rigid film formers.磷化液主要由成膜剂 、 促进剂及添加剂组成.The phosphorated fluid mainly consists of film forming agent, promoter and additive.不纬紫外平照射,爆发平化学不正答,并使成膜剂撮合交联的化合物为感平剂.Via exposu...
The novel sold 200 , 000 copies in hardcover and 2 million in paperback.那本小说的精装本卖了二十万册,平装本卖了两百万册.The hardcover is more expensive.精装本比较贵.Buyers of E - books e - books a good cupper: Traditional hardcover books often coste...