The soft ground has characteristics such as rich natural water content, big air space ratio, high compressibility, low shearing strength and so on.
软土地基具有天然含水量大、空隙比大、压缩性高、抗剪强度低等特点。
Numerical simulation results indicate that in outer space air transportation of powder andenergy utilization ratio.
微小重力下直线流粉粒体空气输送是为了研究一种在太空中可行的材料输送方式.
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