DIN EN ISO 8968-1 E:2013 乳和乳制品 氮含量測定和粗蛋白計算 第1部分:凱氏定氮原理 (ISO/DIS 8968-1:2013) 草案
Draft Document - Milk and milk products - Determination of nitrogen content and crude protein calculation - Part 1: Kjeldahl principle (ISO/DIS 8968-1:2013); German version prEN ISO 8968-1:2013