Last Updated
：2025/11/22
Quizzes for review
(mining) undercutting in a bed of coal in order to bring down the upper mass.
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holing
Before the roof collapse, the miners relied on careful holing to undercut the coal seam and bring down the upper mass in a controlled manner.
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Before the roof collapse, the miners relied on careful holing to undercut the coal seam and bring down the upper mass in a controlled manner.
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