单选题In the horizon system of coordinates what is equivalent to the equator on the Earth?（）.APrime vertical circleBPrincipal vertical circleCParallels of altitudeDHorizon
单选题
In the horizon system of coordinates what is equivalent to the equator on the Earth?（）.
A
Prime vertical circle
B
Principal vertical circle
C
Parallels of altitude
D
Horizon
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