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管涌
在任意方向水头梯度的渗透水流作用下,在土体内部空腔或外部的渗流出口处,首先由细颗粒在粗颗粒形成的孔隙通道中移动流失,继而发展到粗颗粒流失形成管状侵蚀通道的现象(图1)。
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Taxkorgan Tajik Zizhixian
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taxodiaceae of Tang Dynasty at the Shanghuang Taoist Temple of Dujiangyan City
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Tax Office
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taxol producing fungi
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taxonomies of learning
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