单项选择题
A.Toxic gasses may be present
B.Flammable gasses may be present
C.Liquid muds may flood adjoining spaces
D.An oxygen-deficient atmosphere may be present
单项选择题 Records which must be retained on board after report of casualty to a vessel include the（）.
单项选择题 Puncture leaks in the lower tubes or bottom of an inflatable liferaft should FIRST be stopped by using（）.
单项选择题 Point out which one of the following items is not in the charge of Chief Officer in repairing operation（）.