单项选择题
The air cylinder bottles in the survival craft should be refilled with（）.
A.oxygen
B.nitrogen
C.compressed air
D.nitrogen and oxygen
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A.no spark or flame is required to ignite gas or vapor
B.a fuel begins to give off explosive vapors
C.a fuel if ignited will continue to burn
D.a 1% mixture of the fuel with air will explode -
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A.clear syrupy liquid with no odor
B.colorless-to-brown liquid with a choking odor when hot
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