单选题Freon（ ）。ABCDE
单选题
Freon（ ）。
A
B
C
D
E
参考解析
解析：
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The effect that exhaust gas recirculation can reduce NOX formation is partly due to a reduction of the()concentration in the combustion zone and partly due to the content of water and carbon dioxide in the exhaust gas.A.OxygenB.NitrogenC.SulphurD.Freon
WhichofthefollowingisusedinanIBMBladeCentertoprovidecooling?() A.FansforeachbladeB.ChilledWaterC.BlowersD.Freon
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