multiple step短语¹⁴⁴⁹⁷²⁺² 基本例句 un.分步；🌏多步模式；多步的；多重步骤 This paper presents a multiple step and continuous precipitation experiment method to determine the accurate saturation percentages of ammonium sulphate precipitating enzymes. 采用分步连续沉淀酶方法，确定硫酸铵沉淀饱和百分数范围。 ilib