发布网友 发布时间:2022-05-11 10:50
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热心网友 时间:2023-10-11 11:39
Student: OK. I’ve read something about carbon nanotubes. They are strong, alright, but aren’t they just very short little cylinders in shape? Professor: Ah, yes. But these cylinders cling together at a molecular level. 学生问教授,纳米碳管是不是有点短小?教授首先肯定这一点,然后用 but 转折,说纳米碳管的优势。实际上教授认为碳纳米管可以用于建造太空电梯。D 选项正确。