(来学网)纤维状粉尘一般指纵横径之比
  • A.
    (来学网)<2:1的粉尘
  • B.
    (来学网)>2:1的粉尘
  • C.
    (来学网)>3:1的粉尘
  • D.
    (来学网)>5:1的粉尘
  • E.
    (来学网)>10:1的粉尘