(来学网)在人体中元素含量大于多少称为常量元素
  • A.
    (来学网)0.001%
  • B.
    (来学网)0.02%
  • C.
    (来学网)>1%
  • D.
    (来学网)0.1%
  • E.
    (来学网)0.01%