(来学网)我国瓶装饮用纯净水卫生标准规定PH为
  • A.
    (来学网)>5.0
  • B.
    (来学网)6.0~8.5
  • C.
    (来学网)5.0~7.0
  • D.
    (来学网)6.5~8.5
  • E.
    (来学网)5.0~8.5