免费无码又爽又刺激高潮虎虎视频

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              Red Sandstone Disintegrates In Water

              Feb 24, 2018

              Disintegration and swelling of red sandstone under water, under the action of dry and wet cycles, after repeated action of sunlight, the atmosphere, especially rainwater, it easily disintegrates into small fragments, the volume increases slightly, and the expansion rate is about 1 ~ 4% The red sandstone after solution softens with water, and its strength decreases rapidly (some even reach about 40%).


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              免费无码又爽又刺激高潮虎虎视频
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