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单词
hard-coal plough
释义
hard-coal plough
hard-coal plough
[
′härd¦kōl ‚plau̇
]
(mining engineering)
A plough-type cutter-loader consisting of rigid or swiveling kerfing bits which precut the coal in hard-coal seams.
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更新时间:2025/3/17 6:57:24