preparation act预备行为preparationn.准备；预备；配制preparations for a pre-emptive attack进行先发制人打击的准备Preparation of tretinoin dropping pills维甲酸滴丸的研制Preparation of waterborne glazing agent水性上光油的研制Preparation of ammonium ferrous sulfate硫酸亚铁铵的制备Preparation of building sealant samples建筑密封胶试件的制备Preparation of Mushroom Chicken Sausage香菇鸡肉肠的研制Preparations proceeded night and day.准备工作在日夜进行。Preparation of sugar-free pudding milk无糖布丁牛奶的研制开发preparation for postgraduate examination考研Preparation of cerium oxide nanoparicles二氧化铈纳米粒子的制备