A small, unobtrusive smile curved the cook's thin lips.厨师的薄唇一弯，露出一丝不易察觉的微笑。Her spine curved.她的脊柱弯曲了。The ball curved strangely in the air.球在空中划出一道奇异的弧线。...
Diacetone acrylamide ( DAAm ) was prepared by reacting acrylonitrile with diacetone alcoholammonia.以二丙酮醇和丙烯腈为原料,利用简便、温和的反应条件合成新型乙烯基功能单体-双丙酮丙烯酰胺.Crosslinkable acrylic polymer emulsion was obtained by adding acrylic polyme...