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On a cold winter night , the process sleeping in a room with closed door and windows with coal fire burning inside may die due to the excessive accumulation of a) nitrogen monoxide b) nitrogen dioxide c) carbon dioxide d) carbon monoxide

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On a cold winter night , the process sleeping in a room with closed door and windows with
coal fire burning inside may die due to the excessive accumulation of
a) nitrogen monoxide b) nitrogen dioxide
c) carbon dioxide d) carbon monoxide
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d) carbon monoxide
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