单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

A.engaged in underwater construction
B.under sail and power
C.a pilot vessel
D.trawling