单项选择题

A.6mg/ml或离子钙低于2.0~2.5mg/dl
B.7mg/ml或离子钙低于2.5~3.0mg/dl
C.7mg/ml或离子钙低于3.5mg/dl
D.6mg/ml或离子钙低于1.5~2.0mg/dl
E.6mg/ml或离子钙低于3.0~3.5mg/dl