During UMS rounds, a duty engineer notices that the fuel oil overflow observation glass is full of oil. Should he ____.
A、Stop all F.O. transfers immediately, and inform the chief engineer.
B、Make a sounding of the F.O. overflow tank and decide if there is enough capacity to leave it until the following morning.
C、Call a motorman and have him sound the F.O. overflow tank periodically during the night.
D、start the F.O. purifier
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