A polyconic projection is based on a （）.<br>A:plane tangent at one point<br>B:cylinder tangent at one parallel<br>C:cone tangent at one parallel<br>D:series of cones tangent at selected parallels

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

出自：海船船员证

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