span-20中文什么意思

例句与用法

1. 2 ) the shape and average size of the nanometer caco3 particles have been tested through tem . 3 . on the basis of hlb suitable surface - active agents such as polyether , tween - 60 , span - 20 and span - 80 , which exist as capsules , are selected
   3 、根据表面活性剂亲水亲油平衡值选择了聚醚、吐温- 60 、司本- 20和司本- 80作为纳米碳酸钙粒子的表面活性剂，它们以胶囊的形式存在。