1、
The reasons why the seepage destruction takes place are all caused by hydraulic gradient.
渗流破坏的发生,都是由于水力梯度引起的.
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2、
Especially the study on the hydraulic gradient in the inclined pipes is nearly blank.
尤其是各浓度下,倾斜管道中的水力坡度研究几近空白.
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