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
单项选择题 How would you pass a red buoy in the maritime buoyage system“A” （）.
单项选择题 Depiction of TSS's on charts uses（）as the primary color.
单项选择题 A celestial body will cross the prime vertical circle when the latitude is numerically （）.
