| 单词 |
holman counterbalanced drill rig |
| 释义 |
Holman counterbalanced drill rig Holman counterbalanced drill rig[′hōl·mən ¦kau̇nt·ər‚bal·ənst ′dril ‚rig] (mining engineering) A drill rig consisting of a rail-track carriage with a counterbalanced boom 10 feet (3 meters) long. |
| 随便看 |
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