题目内容
(请给出正确答案)
[主观题]
What is the lecture mainly about?A.How astronomers found the correct interpretation for a
What is the lecture mainly about?
A.How astronomers found the correct interpretation for a certain observation
B.How astronomers distinguish between two kinds of nebulae
C.Various improvements to the telescope over the last 300 years
D.An old problem in astronomy that remains unsolved
提问人:网友qunzai
发布时间:2022-01-07