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
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A.diving operations
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A vessel showing a green light over a white light in a vertical line above the level of the sidelights is（）.
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A vessel servicing a pipeline during the day shall display（）.
A.three black shapes in a vertical line; the highest and lowest are balls，and the middle one is a diamond
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C.three black balls in a vertical line
D.two black balls in a vertical line
