单项选择题
A.Ca2+ B.Na+ C.K+ D.Cl-
A.80mg/100ml B.120mg/100ml C.140mg/100ml D.180mg/100ml
A.主动转运 B.单纯扩散 C.易化扩散 D.渗透作用
A.约70% B.约50% C.约25% D.约10%
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