题目
正常细胞膜内钾离子的浓度约为细胞外的
A.12倍
B.20倍
C.30倍
D.32倍
E.13倍
A.12倍
B.20倍
C.30倍
D.32倍
E.13倍
提问时间：2020-10-17
答案
C.30
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