单项选择题
The color of the signal flare sent up by a submarine about to surface due to an emergency condition within the submarine is（）.
A.green B.red C.white D.yellow
单项选择题 The approval period for a shipboard Oil Pollution Emergency Plan expires after（）.
单项选择题 Shipboard Oil Pollution Emergency Plans must be reviewed（）.
单项选择题 Overhauling a fire in the living quarters on a vessel must include（）.
