单选题A polyconic projection is based on a （）.Aplane tangent at one pointBcylinder tangent at one parallelCcone tangent at one parallelDseries of cones tangent at selected parallels
单选题
A polyconic projection is based on a （）.
A
plane tangent at one point
B
cylinder tangent at one parallel
C
cone tangent at one parallel
D
series of cones tangent at selected parallels
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