The fresh air intake of the inert gas system（）.<br>A:prevents the flue gas from falling below 3% content of oxygen<br>B:allows the inert gas piping to be used for gas freeing the tanks<br>C:opens when there is excessive vacuum on the deck water seal<br>D:enables outside air to mix with and cool hot flue gasses

The fresh air intake of the inert gas system（）.
A:prevents the flue gas from falling below 3% content of oxygen
B:allows the inert gas piping to be used for gas freeing the tanks
C:opens when there is excessive vacuum on the deck water seal
D:enables outside air to mix with and cool hot flue gasses

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