简述调查表的种类和用途。

A. 立体零点
B. 自动零点
C. 机械原点
D. 工作零点

A. 正确
B. 错误

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