单项选择题

From your position you observe a rotating white and green light to the north. This light is most likely（）.

A.from a submarine on the surface
B.the light at Southeast Point
C.at an airport
D.on a coastal patrol vessel

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单项选择题

Fishing stake，the position of which frequently（），exist in the area covered by this chart.

A.removed
B.altered
C.corrected
D.converted

单项选择题

Except for N-S courses，and E-W courses on the equator，a great circle track between two points，when compared to a rhumb line track between the same two points，will（）.

A.always be nearer to the equator
B.always be nearer to the elevated pole
C.be nearer to the pole in the Northern Hemisphere and nearer to the equator in the Southern Hemisphere
D.be nearer to the pole or the equator depending on the latitudes of the arrival and departure positions

单项选择题

Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic? （）

A.Flashing
B.Quick flashing
C.Composite group flashing
D.Equal interval (isophase)