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单词
unproductive development
释义
unproductive development
unproductive development
[
¦ən·prə′dək·tiv də′vel·əp·mənt
]
(mining engineering)
The drifts, tunnels, and crosscuts driven in stone, preparatory to opening out production faces in a coal seam or ore body.
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更新时间:2024/11/14 21:45:17