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Sign for optical and acoustic warning of persons in tunnels and underground garages is a folded structure which is made of a transparent plastic sheet, and has a triangular cross section
Sign for optical and acoustic warning of persons in tunnels and underground garages is a folded structure which is made of a transparent plastic sheet, and has a triangular cross section
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机译:隧道和地下车库中人员的视觉和听觉警告标志是一种折叠结构,由透明塑料片制成,并具有三角形横截面
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摘要
The sign (10) for optical and acoustic warning of persons in tunnels and underground garages about a breakdown of a ventilation plant or about a high carbon monoxide level is a folded structure which is made of a transparent plastic sheet, and has a triangular cross section.
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