One of the main purposes of refractories in a boiler furnace is to（）<br>A:help preheat the air for the furnaces<br>B:help preheat the feedwater<br>C:protect economizer from excessive heat<br>D:prevent excessive furnace heat losses

One of the main purposes of refractories in a boiler furnace is to（）
A:help preheat the air for the furnaces
B:help preheat the feedwater
C:protect economizer from excessive heat
D:prevent excessive furnace heat losses

出自：海船船员证

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