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单词
half-header
释义
half-header
half-header
[
′haf ¦hed·ər
]
(mining engineering)
A large cap piece; used by sawing a header in two and placing, generally, two timbers under the half header on one side of the haulage, with the end extending over the haulage.
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更新时间:2025/11/28 23:34:29