(来学网)在人体中含量小于多少的元素,称为微量元素
  • A.
    (来学网)0.1%
  • B.
    (来学网)1%
  • C.
    (来学网)0.01%
  • D.
    (来学网)5%
  • E.
    (来学网)10%