单选题A certificated lifeboatman assigned to command the lifeboat must（）.Abe the first individual to board the craftBdrain the hydraulic pressure before lowering the craftChave a list of the persons assigned to the lifeboatDAll of the above
单选题
A certificated lifeboatman assigned to command the lifeboat must（）.
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
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