大直径钻孔 meaning in English

big hole drilling

Construction technology of drilled pile in karst area
岩溶地区大直径钻孔桩施工技术
Large borehole methane drainage technology
大直径钻孔瓦斯抽放技术
The technology of large diameter bored pier construction on the sea
海上大直径钻孔灌注桩施工技术
Gas drainage in seam with large auto variable diameter bore holes
自动变径大直径钻孔抽放煤层瓦斯试验
Construction technique of ultra - deep bored filling pile with large diameter
超深大直径钻孔灌注桩施工技术

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