(来学网)饮用水经氯化消毒,并接触30min后,游离余氯应为
  • A.
    (来学网)≥0.5mg/L
  • B.
    (来学网)≥0.05mg/L
  • C.
    (来学网)≥0.1mg/L
  • D.
    (来学网)≥0.3mg/L
  • E.
    (来学网)以上都不是
正确答案:
D