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北京统一发布地震预警，这意味着什么
今后，北京发生震级4级或烈度5度及以上的地震，会发布地震预警信息。有人就问为什么？难道北京要地震了？或者要进入活跃期了？
默默有文：新闻主播默默的新闻热点评论168/201
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