单项选择题
A certificated lifeboatman assigned to command the lifeboat should（）.
A.be the first individual to board the craft B.drain the hydraulic pressure before lowering the craft C.have a list of the persons assigned to the lifeboat D.All of the above
单项选择题 （）is not convincing at all.
单项选择题 （）for many years，the AB passed the examination and became an officer.
单项选择题 Whom are you looking（）?I want to see your Chief Mate.
