hollow through dth hammer
hollow through dth hammer
空心通孔锤
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The hollow-through DTH hammer drilling techniques with whole hole reverse circulation is adopted, it is proved that this technique can resolve drilling.
贯通式潜孔锤反循环钻进技术是一种先进的钻探方法，适用于复杂地层中的地质勘探以及各类钻孔工程。
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