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提问人：网友qunzai 发布时间：2022-01-07

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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

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第9题

The basic diversity types include a. time diversity. b. frequency diversity. c. space diversity. d. polarization diversity.

A、对

B、对

C、对

D、对

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