(来学网)用于生活饮用水卫生指标采样的容器需提前加入硫代硫酸钠的浓度为
  • A.
    (来学网)2g/L
  • B.
    (来学网)5g/L
  • C.
    (来学网)10g/L
  • D.
    (来学网)20g/L
  • E.
    (来学网)100g/L