题目内容
储留氮是指
2021-12-30
A.储留氮=食物氮-粪氮
B.储留氮=食物氮-尿氮
C.储留氮=食物氮-(尿氮-粪氮）
D.储留氮=消化率×生物价
E.储留氮=吸收氮-（尿氮-尿内源性氮）
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