单项选择题
When steering by autopilot,how often should the steering be checked?（）
A.12 times on each watch B.When time allows C.At least once a watch D.No checking is necessary
单项选择题 （）is the act of allocating space to containers on board of a container ship in the order of the discharge ports.
单项选择题 According to the relevant regulation, lifeboat should be powered by（）.
单项选择题 Berthing means bringing a vessel to her berth until（）.
