单项选择题
A.the separator is overload
B.the monitor equipment of separator fails
C.the discharge pump of separator can not work
D.the temperature of oil water is low
单项选择题 After stopping oily water separator, sea water should be permitted for （） minutes,（）should be closed after stopping pump to reduce oxidation corrosion of inner wall.
单项选择题 Before the oily water separator put into operation, it should be （）
单项选择题 The time of discharging oil is short, but oily water separator discharges oil frequentlyThe possible reason is （）