What are the basic methods of mining site pressure management? ( )
A、Retention columns (or artificial ) support;
B、Collapse pockets of rocks;
C、Refill of the extraction zone;
D、Support surrounding rock
发布时间：2025-02-01 17:33:08
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答案：Retention columns (or artificial ) support ■Collapse pockets of rocks ■Refill of the extraction zone
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