题目内容

关于用凯氏定氮法测定乳制品中蛋白质的叙述错误的是()。

A. 试样处理时将定氮瓶以450角斜于石棉网上
B. 液体呈蓝绿色并澄清透明后再继续加热0.5～1h
C. 蒸馏时在蒸汽发生器内装水至1/2处
D. 为保持水呈酸性，向蒸汽发生器内加甲基红乙醇溶液及数毫升硫酸

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