A.sludge
B.water
C.micro-organism growth
D.all of the above
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A.burned exhaust valves
B.excessive spring compression
C.spring surge
D.worn valve seats
A.worn valve seats
B.worn main bearing
C.excessive valve clearance
D.weak rocker arm springs
A.spark from a plug in the pre-combustion chamber
B.electrical discharge from the distributor
C.heat of compression within the cylinder
D.heat from the fuel injection nozzle
A.engine operating speed
B.an air manifold
C.a hydraulic distributor
D.individual cams and valve gear
A.the air start valve timing gears and rods
B.a cylinder check valve
C.individual cams and valve gear
D.an air manifold poppet valve
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When does auxiliary burner of incinerator put into operation? （）Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish
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