The error in the measurement of the altitude of a celestial body，caused by refraction，increases as the（）.<br>A:horizontal parallax decreases<br>B:observer's height above sea level increases<br>C:humidity of the atmosphere decreases<br>D:altitude of the body decreases

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

出自：海船船员证

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