题目：
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
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A
