The equator is（）.<br>A:the primary great circle of the Earth perpendicular to the axis<br>B:the line to which all celestial observations are reduced<br>C:the line from which a celestial body's altitude is measured<br>D:All of the above

The equator is（）.
A:the primary great circle of the Earth perpendicular to the axis
B:the line to which all celestial observations are reduced
C:the line from which a celestial body's altitude is measured
D:All of the above

出自：海船船员证

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