单项选择题

In very high latitudes，the most practical chart projection is the（）.

A.Mercator
B.Gnomonic
C.Azimuthal
D.Lambert conformal

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How would you pass a red buoy in the maritime buoyage system“A” （）.

A.keep the buoy on the vessel's starboard side when approaching a port and on the vessel's port side when leaving
B.keep the buoy on the vessel's port side when approaching a port and on the vessel's starboard side when leaving
C.keep the buoy on the vessel's starboard side when approaching and leaving
D.keep the buoy on the vessel's port side when approaching and leaving

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Depiction of TSS's on charts uses（）as the primary color.

A.magenta
B.deep red
C.bright red
D.red

单项选择题

A celestial body will cross the prime vertical circle when the latitude is numerically （）.

A.Greater than the declination and both are of the same name
B.Less than the declination and both are of the same name
C.Greater than the declination and both are of contrary name
D.Less than the declination and both are of contrary name