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单词
longwall pillar working
释义
longwall pillar working
longwall pillar working
[
′lȯŋ‚wȯl ¦pil·ər ‚wərk·iŋ
]
(mining engineering)
A technique used to extract coal pillars left behind in long-pillar working.
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更新时间:2024/12/23 19:40:48