In the horizon system of coordinates what is equivalent to the equator on the Earth?（）.<br>A:Prime vertical circle<br>B:Principal vertical circle<br>C:Parallels of altitude<br>D:Horizon

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

出自：海船船员证

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