單項(xiàng)選擇題Proper use shall be made（）radar equipment if fitted and operational.
A.of
B.to
C.on
D.with
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1.單項(xiàng)選擇題Keep clear（）the buoy.
A.to
B.on
C.of
D.for
2.單項(xiàng)選擇題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
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