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civil air-defence engineering
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civil air-defence engineering
人防工程
为防范或减轻战争危害,保护国家和人民生命财产安全,按预定防护要求修建的人民防空用途的防护工程。全称人民防空工程,又称人防工事,其他国家称民防工程。
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Zheng Xuan's Preface to the Classic of Poetry
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