单项选择题
A.flattening of the bowl neoprene O-rings
B.operation within the explosive rang of the fuel
C.excessive purifier operating pressures
D.excessive oil viscosity
单项选择题 Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?（）
单项选择题 Which of the following problems will occur if a disk-type centrifugal lube oil purifier is not properly primed prior to admitting oil flow to the bowl?（）
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（）