单选题What is the major advantage of high altitude observations?（）AErrors due to unusual parallax are eliminatedBThe same body can be used for a fix from observations separated by several minutesCThe declination is the only information needed from the almanacDThe semidiameter correction of the sextant altitude is eliminated
单选题
What is the major advantage of high altitude observations?（）
A
Errors due to unusual parallax are eliminated
B
The same body can be used for a fix from observations separated by several minutes
C
The declination is the only information needed from the almanac
D
The semidiameter correction of the sextant altitude is eliminated
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