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Explosives and Explosive Ordnance Disposal
containing
保护人
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人工保护盘
为保证井筒延深作业的安全,在原生产井筒的井窝内构筑的、阻挡坠落物的临时结构物
manmade safety staging
人工保护盘
为保证井筒延深作业的安全,在原生产井筒的井窝内构筑的、阻挡坠落物的临时结构物
protective bulkhead
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