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在井下采矿生产中,因顶板冒落而造成人员伤亡,设备损坏的事故时有发生,通常这都是由于人们未及时掌握顶板变化情况,不能及时采取防护措
In the underground mine production, the casualties caused by roof caving and the accident of equipment damage have occurred frequently. This is usually due to the fact that people are not in a position to grasp the changes of the roof in time and can not take timely protective measures