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One of the main purposes of refractori


One of the main purposes of refractories in a boiler furnace is to()

  • Ahelp preheat the air for the furnaces
  • Bhelp preheat the feedwater
  • Cprotect economizer from excessive heat
  • Dprevent excessive furnace heat losse
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分类:船舶电气与船舶安全题库