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

A.Altitude
B.Zenith
C.Declination
D.Zenith distance

单项选择题

A.Prime vertical circle
B.Principal vertical circle
C.Parallels of altitude
D.Horizon

单项选择题

A.be circumpolar
B.have a declination equal to or greater than your latitude
C.have a GHA of 180°
D.have the SHA equal to or less than the LHA