hand sinking
... 人字齿 double helical tooth 人工凿井 hand sinking 人工取样 hand sample ...
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冻结设计是人工冻结法凿井工程技术核心，关系到整个冻结工程的成败。
In the artificial freezing shaft sinking project, the freeze design is a core technology, which relates to the entire freezing project success or failure.
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