hardpan
... hardpan 砂砾层 hardpan 硬质地层 hardpaste 硬瓷 ...
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运用西安理工大学自主研发的新型旋转触探仪，针对软岩等硬质地层进行旋转触探试验，显示了独特的优越性。
This paper uses a new rotary penetration instrument independently developed by Xi'an University of Technology, it shows a unique advantage in soft rock and other hard material layer.
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