单选题The height of eye correction is smaller than geometrical dip because of （）.Athe angle between the horizontal and the line of sight to the visible horizonBindex errorCparallaxDterrestrial refraction
单选题
The height of eye correction is smaller than geometrical dip because of （）.
A
the angle between the horizontal and the line of sight to the visible horizon
B
index error
C
parallax
D
terrestrial refraction
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