单项选择题

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

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

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单项选择题

（）is the distance east or west measured in degrees，minutes and seconds of arc on the equator between the prime meridian and the meridian passing through the place.

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