(来学网)室内空气氟含量卫生标准,日平均允许浓度是
  • A.
    (来学网)0.07MG/M3
  • B.
    (来学网)0.007MG/M3
  • C.
    (来学网)0.05MG/M3
  • D.
    (来学网)0.003MG/M3
  • E.
    (来学网)0.005MG/M3
正确答案:
B