A.final topping off is occurringB.first starting to rec……

单项选择题Smoking in bed on a ship is prohibited（）.

A.at all times
B.during evening hours
C.unless another person is present
D.during drilling operations

单项选择题Should the vessel have no deratisation certificate at the time of her delivery，she（）be held to be unseaworthy.

A.shall
B.should
C.may
D.would

单项选择题Proper use shall be made（）radar equipment if fitted and operational.

A.of
B.to
C.on
D.with

单项选择题Keep clear（）the buoy.

A.to
B.on
C.of
D.for

单项选择题In the International Code of signals，a group of three letters indicates（）.

A.urgency or an emergency
B.the vessel's national identity signal
C.a group from the general signal code
D.a group from the medical signal code