单项选择题
You are standing the wheelwatch on entering port and the master gives you a rudder command which conflicts with a rudder command from the pilot.What should you do?（）
A.obey the master‟s B.obey the pilot‟s C.bring the rudder to a position midway between the two conflicting orders D.ask the pilot if he relinquishes control
单项选择题 （）is used for lifting cargo.
单项选择题 The original equilibrium position is stable when（）.
单项选择题 Emergency escape breathing device on board shall have a duration of service no less than（）.
