Fins are installed on the generating tube surfaces in waste heat boilers to （）.<br>A:prevent soot fires in the exhaust system<br>B:prevent exhaust gas erosion of the tubes<br>C:increase the velocity of exhaust gas flow<br>D:increase the rate of heat transfer

Fins are installed on the generating tube surfaces in waste heat boilers to （）.
A:prevent soot fires in the exhaust system
B:prevent exhaust gas erosion of the tubes
C:increase the velocity of exhaust gas flow
D:increase the rate of heat transfer

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