A . 6mg/ml或离子钙低于2.0~2.5mg/dlB . 7mg/ml或离子钙低于2.5~3.0mg/dlC . 7mg/ml或离子钙低于3.5mg/dlD . 6mg/ml或离子钙低于1.5~2.0mg/dlE . 6mg/ml或离子钙低于3.0~3.5mg/dl
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