单项选择题
A.18 B.20 C.9 D.21
A.12% B.14% C.16% D.15%
A.50%~55% B.60%~70% C.65%~75% D.55%~65%
A.蛋白质 B.葡萄糖 C.脂肪 D.氨基酸
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