单选题Superior conjunction occurs when（）.Athe Sun is at maximum declination north or southBa planet crosses the external plane of the eclipticCthe Sun is between the Earth and a planetDtwo planets are in line
单选题
Superior conjunction occurs when（）.
A
the Sun is at maximum declination north or south
B
a planet crosses the external plane of the ecliptic
C
the Sun is between the Earth and a planet
D
two planets are in line
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