The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.<br>A:operating the boiler at less than normal water level<br>B:installing fins on the firesides of water-tubes<br>C:increasing the amount of excess air to the burners<br>D:treating the boiler water with chemical oxygen scavengers

The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.
A:operating the boiler at less than normal water level
B:installing fins on the firesides of water-tubes
C:increasing the amount of excess air to the burners
D:treating the boiler water with chemical oxygen scavengers

出自：海船船员证

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