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coal dust cloud
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coal dust cloud
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矿尘
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coal dust cloud
煤尘云
粒径小于1毫米,其中大部分小于0.075毫米的大量煤尘弥散在空气中形成的高浓度的煤尘与空气的混合物。
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document acquisition
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Documentary
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Documentary Film Handbook
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