NASA ScienceCasts: 固定我们在太空中的位置

在国际空间站上实行并研究微重力下的水泥基混凝土的实验。 ISS Science: http://www.nasa.gov/iss-science NASA Science: http://science.nasa.gov/ 点击这里查看更多视频:https://alugha.com/NASA

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