(来学网)只经氯消毒即供饮用者,原水总大肠菌群不应超过
  • A.
    (来学网)1000cfu/L
  • B.
    (来学网)10000cfu/L
  • C.
    (来学网)5000cfu/L
  • D.
    (来学网)2000cfu/L
  • E.
    (来学网)500cfu/L