单项选择题
The size of the discharge ring used for the efficient operation of a disk type purifier is dependent upon the（）
A.rated capacity of that purifier B.viscosity of the oil being purified C.maximum design speed of that purifier D.specific gravity of the oil being purified
单项选择题 In a disk-type lubricating oil purifier, （）
单项选择题 In sewage treatment, the term maceration refers to the process of （）
单项选择题 Which of the equipment listed is most effective in processing bilge slops for overboard discharge?（）
