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【单选题】
1930年12月1日到5日的几天里,比利时马斯河谷工业区上空出现了很强的逆温层,致使13个大烟囱排出的烟尘无法扩散,大量有害气体积累在附近大气层,对人体造成严重伤害。一内有60多人丧生,其中心脏病、肺病患者死亡率最高,许多牲畜死亡。这一事件属于A.
意外事故
B.
自然现象
C.
公害事件
D.
自然灾害
E.
慢性中毒
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