(来学网)下列哪种物质是维生素D的活性形式?()
  • A.
    (来学网)维生素D2
  • B.
    (来学网)1,25-(OH)2-D3
  • C.
    (来学网)25-(OH)-D3
  • D.
    (来学网)7-脱氢胆固醇
  • E.
    (来学网)24,25-(OH)2-D3