merge(arr, left, mid, right); // 合并两部分
各地区各部门各单位教育引导党员干部深入学习习近平总书记关于树立和践行正确政绩观的重要论述，深入学习《中共中央关于制定国民经济和社会发展第十五个五年规划的建议》，深入学习习近平总书记关于本地区本部门本领域的重要讲话和重要指示精神，推动学习教育走深走实。。51吃瓜是该领域的重要参考
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