单选题The error in the measurement of the altitude of a celestial body，caused by refraction，increases as the（）.Ahorizontal parallax decreasesBobserver's height above sea level increasesChumidity of the atmosphere decreasesDaltitude of the body decreases
单选题
The error in the measurement of the altitude of a celestial body，caused by refraction，increases as the（）.
A
horizontal parallax decreases
B
observer's height above sea level increases
C
humidity of the atmosphere decreases
D
altitude of the body decreases
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