模态框（Modal）标题

在这里添加一些文本

模态框（Modal）标题

在这里添加一些文本
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Study of Roof Control technology and rule of ground pressure when lower leaf fully mechanized workface going out top coal pillar of Close distance coal seams
彭海兵，李瑞群
COAL ENGINEERING . 2015, (8): 84 -87 .  DOI: 10.11799/ce201508028

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