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1·The reinforced concrete base of a chimney to be demolished is near to a distribution station and breast wall sensible to blasting vibration and there is an important high voltage line over it.

待拆烟囱的钢筋混凝土基础紧邻对爆破震动极为敏感的配电站和挡土墙，其上方又有重要的架空高压输电线。