preparationsn.准备,准备工作,配制剂(名词preparation的复数形式)
preparationn.准备;预备;配制
preparation of dyestuff染料制备
preparation for polymer聚合物制备
preparation of specimen制造样品,标本制备法
preparation in quantity成批制备
preparation improvement制备改进
preparation for samples样品制备
preparation-technique制备方法
preparation for lessons上课的准备; 备课
preparation for defence防御准备
preparation of the soil整土