单项选择题
A.5%~10% B.14%~15% C.20%~25% D.25%~30% E.20%~35%
A.钠 B.钾 C.钙 D.镁 E.铁
A.5% B.10%~15% C.15%~25% D.25%~35% E.35%~45%