单项选择题
A.5%~8% B.10%~15% C.16%~19% D.20%~25% E.25%~30%
A.Cl- B.Na+ C.K+ D.HCL E.内因子
A.6%~9% B.16%~19% C.23%~29% D.36%~39% E.46%~49%