暴露于房屋或建筑结构外的控制性火焰下 Exposure to controlled fire, not in building or structure
暴露于房屋或建筑结构内的控制性火焰下 Exposure to controlled fire in building or structure
暴露于房屋或建筑结构内的无控制性火焰下 Exposure to uncontrolled fire in building or structure
暴露于房屋或建筑结构外的无控制性火焰下 Exposure to uncontrolled fire, not in building or structure
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