单选题:引起手足搐搦的血钙水平为

题目内容:
引起手足搐搦的血钙水平为 A.血总钙浓度2mmol/L(8mg/dl)
B.血总钙浓度1.75-1.8mmol/L(7-7.5mg/dl)
C.游离钙浓度1.4mmol/L(5.5mg/dl)
D.游离钙浓度1.5mmol/L(6.0mg/dl)
E.游离钙浓度1.6mmol/L(6.5mg/dl)

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