单选题The time of discharging oil is short, but oily water separator discharges oil frequentlyThe possible reason is （）Athe sensor of low oil level is fully covered by sludgeBthe coarse strainer before the pump in suction system is cloggedCthe screw pump is worn seriously and volumetric efficiency is decreasedDbilge suction value is clogged
单选题
The time of discharging oil is short, but oily water separator discharges oil frequentlyThe possible reason is （）
A
the sensor of low oil level is fully covered by sludge
B
the coarse strainer before the pump in suction system is clogged
C
the screw pump is worn seriously and volumetric efficiency is decreased
D
bilge suction value is clogged
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