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One of the disadvantages of using carbon dioxide to extinguish a fire in an enclosed space is （）.
A:the "snow" which is sometimes discharged along with the gas is toxic
B:prolonged exposure to high concentrations of  C0₂ gas causes suffocation
C:rapid dissipation of the C0₂ vapor
D:the C0₂ gas is lighter than air and a large amount is required to extinguisha fire near the deck

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出自：海船船员证

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