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You have completed a crude oil wash。What action should be taken with the oil in the lines running to the washing machines?( )。
A.
Pull a suction using the supply line pump
B.
Open a COW nozzle forward and one aft and drain the line into the after tank by gravity
C.
Close off all valves in the system and leave the oil in the line primed for the next crude oil wash
D.
Blow the line ort using compressed air