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vertical excavation limited area
This method of excavation is used in loose or wet soils--unconsolidated formations-- where the banks must be supported by shoring or sheathing. The material must, out of necessity, be lifted out vertically.
- 词性: noun
- 行业/领域: 采矿
- 类别 一般矿业; Mineral mining
- Government Agency: USBM
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创建者
- ed.young
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(Milwaukee, United States)