单项选择题
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
A vessel sighting a northern right whale dead ahead sho...
单项选择题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
A vessel showing a rigid replica of the International C...
单项选择题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
A vessel showing a green light over a white light in a ...
单项选择题A vessel showing a green light over a white light in a vertical line above the level of the sidelights is（）.
A.engaged in underwater construction B.under sail and power C.a pilot vessel D.trawling
