(来学网)有生育打算的正常育龄妇女备孕前补充叶酸的量应是
  • A.
    (来学网)0.1mg/d
  • B.
    (来学网)0.4mg/d
  • C.
    (来学网)1mg/d
  • D.
    (来学网)2mg/d
  • E.
    (来学网)4mg/d