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單項(xiàng)選擇題

The air cylinder bottles in the survival craft should be refilled with（）.

A.oxygen
B.nitrogen
C.compressed air
D.nitrogen and oxygen

單項(xiàng)選擇題

The (auto)ignition temperature is that temperature atwhich（）.

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