单项选择题

（）can not cause oil flow from water outlet of self-cleaning separator.

A.Oil temperature too high
B.Diameter of gravity disc too large
C.Oil temperature too low
D.High level tank out of water

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单项选择题

A.Oil inlet valve opening too quickly
B.Oil temperature too high
C.Diameter of gravity disc too small
D.Viscosity of oil too low

单项选择题

A.cut off the power
B.cut off the oil inlet
C.open guide water valve
D.close oil outlet value

单项选择题

A.acid
B.sludge
C.mechanical impurity
D.salinity