问题
单项选择题
A celestial body’s complete orbit around another body is（）.
A.a rotation
B.a revolution
C.space motion
D.nutation
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
A celestial body’s complete orbit around another body is（）.
A.a rotation
B.a revolution
C.space motion
D.nutation
参考答案：B