单选题A gnomonic projection is based on a(n)（）.Aplane tangent at one pointBcylinder tangent at the equatorCcone tangent at one parallelDinfinite series of cones tangent at selected parallels
单选题
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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