单项选择题
A vessel engaged in replenishment or transferring persons，provisions or cargo while under way can be regarded as（）.
A.a vessel restricted in her ability to maneuver B.a vessel engaged in laying，serving or picking up a navigation mark，submarine cable or pipeline C.a vessel not under command D.a power-driven vessel
单项选择题 A hydraulic accumulator is designed to（）.
单项选择题 A fishing vessel that is required to have a fireman’s outfit，must have all of the following in the outfit except a（）.
单项选择题 A fire starting by spontaneous combustion can be expected in which condition?（）
