“Holman counterbalanced drill rig”的概念、定义、翻译、参考文献-科学参考

单词	Holman counterbalanced drill rig
释义	Holman counterbalanced drill rig [`hōl·mǝn ¦kau̇nt·ǝr´bal·ǝnst `dril ´rig] ^{MINING ENGINEERING} A drill rig consisting of a rail-track carriage with a counterbalanced boom 10 feet (3 meters) long.
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