單項(xiàng)選擇題

A great circle track provides the maximum saving in distance on（）.

A.easterly courses in high latitudes
B.southerly courses in high latitudes
C.westerly courses in low latitudes
D.easterly courses in low latitudes that cross the equator

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單項(xiàng)選擇題

A gnomonic projection is based on a(n)（）.

A.plane tangent at one point
B.cylinder tangent at the equator
C.cone tangent at one parallel
D.infinite series of cones tangent at selected parallels

單項(xiàng)選擇題

（）refers to the angle between true North and the heading line of the ship.

A.True position
B.True meridian
C.True course
D.True bearing