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针对中硬煤层在放顶煤开采时易产生大块煤，使得放煤困难，造成资源浪费的问题，实施了顶煤预裂爆破，并取得了良好效果。
In view of the hard coal in the top coal caving prone to large coal, making coal difficult, resulting in waste of resources, the implementation of the top coal pre-cracking blasting, and achieved good results.