银汉鱼目飞鱼科约40种海洋鱼类的统称.Any of about 40 species of oceanic fishes ( family Exocoetidae ).银汉是由无数颗恒星组成的星际体系.The Milky Way is a galactic system made up of many fixed stars....
Acrylic resin ( ACR ), as an impact modifier for R - PVC, was synthesized by latex interpenetrating poly - mer network technique.采用乳液聚合技术合成了硬聚氯乙烯(R - PVC)抗冲击改性剂丙烯酸酯类聚合物 ( ACR ).The copolymer latex of butyl acrylate and V...