(来学网)正常人血浆中钙、磷浓度乘积是
  • A.
    (来学网)40~50mg/dl
  • B.
    (来学网)45~50mg/dl
  • C.
    (来学网)30~35mg/dl
  • D.
    (来学网)36~40mg/dl
  • E.
    (来学网)没有固定关系