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单词
long hole
释义
long hole
long hole
[
′lȯŋ ‚hōl
]
(mining engineering)
An underground borehole and blasthole exceeding 10 feet (3 meters) in depth or requiring the use of two or more lengths of drill steel or rods coupled together to attain the desired depth.
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更新时间:2025/4/1 7:01:56