单项选择题
A.check and regulate the water level B.close the air cock once fires are lit C.blowdown the gage glass D.crack the steam stop to assure protective steam flow
After a normal, or safety shutdown, automatic combustio...
单项选择题After a normal, or safety shutdown, automatic combustion control systems for an auxiliary boiler are designed to prevent the immediate re-firing of a burner in order for the （）.
A.furnace to be re-purged B.electric charge to buildup in the igniter C.fuel pump to restart D.drum level to stabilize
（） will be used to blow away soot and the combustion pr...
单项选择题（） will be used to blow away soot and the combustion products from the tube surfaces.
A.The blow down valve B.The scum valve C.The air release cock D.Scot-blower
The correct pH value of boiler water is achieved by con...
单项选择题The correct pH value of boiler water is achieved by continuous addition of a suitable （） to the feed.
A.acid B.alkali C.salt D.None of the above
