A gnomonic projection is based on a(n)（）.
- Aplane tangent at one point
- Bcylinder tangent at the equator
- Ccone tangent at one parallel
- Dinfinite series of cones tangent at selected parallel
问题
A gnomonic projection is based on a(n)
参考解析：
分类：航海学基本知识题库
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