单项选择题

（）can cause oil flow from water outlet of a separator.

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

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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

单项选择题

A.too little seal water
B.improper gravity disc
C.oil discharging pump not working very well
D.low water level of the working water