A、firing for extended periods in the low fire mode
B、overheating, due to waterside deposits
C、varying the water level above the crown sheet
D、carrying excessive alkalinity in the boiler water
更多“A distorted furnace in a fire-tube auxiliary boiler may be the result of （）”相关的问题
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
A、A.cool the furnace to prevent pre-ignition B、B.remove explosive vapors from the furnace C、C.evaporate accumulated unburned fuel oil D、D.provide sufficient air in the furnace to allow ignition of the fuel
A、Effect只对文字物体起作用，并不能改变文字物体中的文字规格 B、对一个物体只能施加一种效果 C、Effect菜单下的Distort命令和Filter菜单中的Distort命令是相同的 D、Effect菜单下列出的各项命令不但改变物体的外观属性，而且还改变物体的本身结构
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