(来学网)人体血液平均每100m中含K+19mg,则血液中K+(K+的摩尔质量为39g/mo)的浓度约为
  • A.
    (来学网)4.9mol/L
  • B.
    (来学网)0.49mol/L
  • C.
    (来学网)0.049mol/L
  • D.
    (来学网)0.0049mol/L
  • E.
    (来学网)49mol/L