Fins are installed on the fireside of water-tubes used in waste boiler to（）<br>A:decrease the velocity of gases flowing past the tubes<br>B:increase the rate of heat transfer<br>C:reduce accumulations carbon deposits<br>D:direct the flow of gases

Fins are installed on the fireside of water-tubes used in waste boiler to（）
A:decrease the velocity of gases flowing past the tubes
B:increase the rate of heat transfer
C:reduce accumulations carbon deposits
D:direct the flow of gases

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