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单项选择题
A.blue
B.green
C.orange
D.purple
单项选择题
A.excessive condenser cooling water
B.warm food in the refrigerator
C.a shortage of refrigerant
D.s shortage of compressor oil
单项选择题
A.either all the way open or all the way closed
B.normally open
C.throttled depending on load
D.controlled by suction pressure
单项选择题
A.(1) only
B.(2) only
C.(1) and (2)
D.(1), (2) and (3)
单项选择题
A.Control of evaporation
B.A separate means to prevent feed-water contamination
C.Power circulating pump
D.Super-heater
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
单项选择题
A.furnace to be re-purged
B.electric charge to buildup in the igniter
C.fuel pump to restart
D.drum level to stabilize
单项选择题
A.The blow down valve
B.The scum valve
C.The air release cock
D.Scot-blower
单项选择题
A.acid
B.alkali
C.salt
D.None of the above
单项选择题
A.proper combustion
B.water in the fuel
C.excess air
D.cold fuel oil