单项选择题
A.take no measures B.extinguish the fire as soon as possible C.feed water to the boiler D.open the blow down valve
The boiler feed water check valves are located on the （...
单项选择题The boiler feed water check valves are located on the （）
A.feed pump suction line B.hot well C.shell of the feed heater D.feed lines to the boiler
The water level in a steaming auxiliary boiler will alw...
单项选择题The water level in a steaming auxiliary boiler will always （）
A.rise when the steam pressure is increased B.remain constant as long as the feed pump operates C.fall when the steam pressure is decreased D.vary as the steam demand changes
The donkey boiler may be given a bottom blow （）A.to rai...
单项选择题The donkey boiler may be given a bottom blow （）
A.to raise water level B.only while making steam C.to remove scum D.when fire are secured
