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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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单选题A polyconic projection is based on a （）.A
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mimimum oxygen content lineB
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单选题A SELECT statement can be used to perform these three functions: 1.Choose rows from a table. 2.Choose columns from a table. 3.Bring together data that is stored in different tables by creating a link between them. Which set of keywords describes these capabilities?（）A
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selection, intersection, joinD
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infinite series of cones tangent at selected parallels
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