可燃性气体具有燃烧爆炸性,扩散性,可压缩性和膨胀性,带电性,毒害性,腐蚀性等特性
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
爆炸下限大于10%的可燃气体为甲类危险火灾,爆炸下限小于10%的可燃气体为乙类危险火灾。( )
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