a method of drilling in which an annular hole is made in the ground and a core extracted; core-sampling.
| 单词 | θ210354 |
| 释义 | society > occupation and work > industry > mining > [noun] > drilling for samples (2) core-drilling1903 a method of drilling in which an annular hole is made in the ground and a core extracted; core-sampling. core-sampling1927 core-drilling in order to obtain a core as a sample of the strata pierced. |
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