單項(xiàng)選擇題

A vessel towing a barge astern would show，at the stern（）.

A.only a stern light
B.a towing light above the stern light
C.two towing lights in a vertical line
D.two white lights in a vertical line

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單項(xiàng)選擇題

A vessel sighting a northern right whale dead ahead should（）.

A.maintain course and speed
B.alter course to give a wide clearance
C.report the whale's position to the Canadian Coast Guard
D.All of the above

單項(xiàng)選擇題

A vessel showing a rigid replica of the International Code flag “A” is engaged in（）.

A.diving operations
B.dredging
C.fishing
D.mineclearance operations