| 单词 | prospecting drill |
| 释义 | > as lemmasprospecting drill prospecting drill n. ΚΠ 1870 Manufacturer & Builder Mar. 73/3 An open-cut or quarry drill..is similar in construction to a No. 2 Prospecting Drill detached from boiler. 1897 Jrnl. Polit. Econ. 6 13 The prospecting drill, which enables a sample to be taken of every foot of rock through which it passes. 1995 Mining Jrnl. (Nexis) 1 Dec. 2 Prospecting drills can also be used..for precision drilling in existing concrete structures. < as lemmas |
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