单选题An amplitude of the Sun in high latitudes（）.Ais most accurate before sunriseBis most accurate after sunsetCshould only be observed when the Sun's lower limb is above the horizonDis most accurate when the Sun's center is observed on the visible horizon
单选题
An amplitude of the Sun in high latitudes（）.
A
is most accurate before sunrise
B
is most accurate after sunset
C
should only be observed when the Sun's lower limb is above the horizon
D
is most accurate when the Sun's center is observed on the visible horizon
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