单选题Apparent altitude is sextant altitude corrected for（）.Aparallax and personal errorBinaccuracies in the reading and reference levelCvisibility and magnitudeDAll of the above are correct
单选题
Apparent altitude is sextant altitude corrected for（）.
A
parallax and personal error
B
inaccuracies in the reading and reference level
C
visibility and magnitude
D
All of the above are correct
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