（三）在铁路、城市轨道交通线路、桥梁、隧道、涵洞处挖掘坑穴、采石取沙的；
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"If we're producing technology our customers can't live with, that's our failing," he says, explaining that FireAngel alarms have been calibrated to avoid making them overly sensitive, in order to reduce false alarms.
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