子弹砰地射进了天花板，掉落的石膏碎片落了他们一身。The bullet slammed into the ceiling, spraying them with bits of plaster.我家房子的一些内墙是石膏板做的。Some of the internal walls of my house are made of plasterboard.天花板很高，上面装饰着石膏水果和花朵。It had a high ceiling, o...
The products were analyzed simultaneously using ethyl benzoate ( EB ) as internal standard.以苯甲酸乙 酯 为内标物,一次性同时分析了塔釜产物中各组分含量.The crude, wet benzoate ( 118 grams ) was dissolved with reflux in 1 , 400 ml methanol.将粗制 、 湿的苯甲...