Generating tubes in waste heat boilers are finned to （）.<br>A:reduce gas flow turbulence<br>B:prevent exhaust gas corrosion<br>C:increase the rate of combustion<br>D:increase the rate of heat transfer

Generating tubes in waste heat boilers are finned to （）.
A:reduce gas flow turbulence
B:prevent exhaust gas corrosion
C:increase the rate of combustion
D:increase the rate of heat transfer

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