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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單項(xiàng)選擇題

Keep clear（）the buoy.

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

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