A flame screen（）.<br>A:permit the passage of vapor but not of flame<br>B:prevents the passage of flammable vapors<br>C:prevents inert gas from leaving a tank<br>D:permits vapors to exit but not enter a tank

A flame screen（）.
A:permit the passage of vapor but not of flame
B:prevents the passage of flammable vapors
C:prevents inert gas from leaving a tank
D:permits vapors to exit but not enter a tank

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