A.defective solenoid valve
B.dirty fuel nozzle
C.grounded high tension lead
D.faulty ignition cable connector
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A.excessive purging before lighting off
B.insufficient trail for ignition period
C.a faulty transformer in the ignition circuit
D.insufficient purging before lighting off
A.prevent engine back pressure at heavy loads
B.increase total engine efficiency at low loads
C.prevent boiler corrosion at low engine loads
D.improve engine fuel consumption at any load
A.steam demand is high
B.salinity is high
C.safety valve simmers
D.burner flame is extinguished
A.incorrect electrode setting
B.incorrect nozzle position
C.clogged fuel nozzle
D.broken high tension lead
A.relight the boiler immediately to prevent loss of steam pressure
B.relight the fire off the brickwork as the bricks are cherry red
C.purge the furnace of any combustible gases before attempting to relight the fire
D.speed up the feed pump to prevent dry firing when the burner flame is reestablished
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
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