单项选择题
A.flushing separator with hot water
B.increasing water supply flow
C.heat oily water properly
D.opening manual oil discharge value
单项选择题 If found oil when we open low oil level plug of separator, it indicates （）
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 （）