单项选择题

In the navigational triangle，the angle at the elevated pole is the（）.

A.meridian angle
B.altitude
C.right ascension
D.azimuth angle

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单项选择题
In the horizon system of coordinates what is equivalent to latitude on the Earth?（）.

A.Altitude
B.Zenith
C.Declination
D.Zenith distance
单项选择题
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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