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【多选题】
对脱水性质认识正确的是
A.
脱水是指水分摄入不足或丢失过多而引起的体液总量，尤其是细胞外液量的减少
B.
血清钠浓度来表示细胞外液的渗透压
C.
婴儿腹泻以等渗性脱水最常见
D.
等渗性脱水时细胞内液量无明显改变
E.
低渗性脱水时可引起脑血管扩张充血
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