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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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The Peddler and the Beauty
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the pens unearthed in Qin and Han dynasties
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the people
The people are more important than the ruler
The people are the foundation of the state
The People in The Picture
The people may be made to follow a path of action, but they may not be made to understand it
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The People's Republic of China Entry and Exit Animal and Plant Quarantine Law
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