All straight lines represent great circle tracks on a chart based on a(n) （）.<br>A:Mercator projection<br>B:polyconic projection<br>C:orthographic projection<br>D:gnomonic projection

All straight lines represent great circle tracks on a chart based on a(n) （）.
A:Mercator projection
B:polyconic projection
C:orthographic projection
D:gnomonic projection

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