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...
Aquifers have water contents over 30 %.含水层的水含过30%.Untrammelled industrialisation, particularly in poor countries, is contaminating rivers and aquifers.不节制的工业化, 尤其是在穷国, 正在污染河流和地下含水层们.There are three types of aquifers: per...