单项选择题

A semidiameter correction is applied to observations of（）.

A.Mars
B.the Moon
C.Jupiter
D.All of the above

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单项选择题
A phase correction may be applicable to correct the sextant altitude correction of（）.

A.any star
B.the Sun
C.third magnitude stars only
D.some planets
单项选择题
A phase correction is applied to observations of（）.

A.the Sun
B.stars
C.planets
D.All of the above
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