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