.细胞内液最主要的阳离子为()
A.K_TagUpStart_十_TagUpEnd_
B.Ca_TagUpStart_2_TagUpEnd__TagUpStart_十_TagUpEnd__TagUpStart__TagUpEnd_
C.Mg_TagUpStart_2_TagUpEnd__TagUpStart_+_TagUpEnd_
D.Fe_TagUpStart_2_TagUpEnd__TagUpStart_十_TagUpEnd_
E.Na
正确答案:A
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