单项选择题
A.at all times B.during evening hours C.unless another person is present D.during drilling operations
Should the vessel have no deratisation certificate at t...
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
Proper use shall be made（）radar equipment if fitted and...
单项选择题Proper use shall be made（）radar equipment if fitted and operational.
A.of B.to C.on D.with
Keep clear（）the buoy.A.toB.onC.ofD.for
单项选择题Keep clear（）the buoy.
A.to B.on C.of D.for
