A.throughput
B.back pressure
C.gravity disc
D.None of the above is wrong
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A.scale
B.sludge
C.chemicals
D.air
Exhaust temperature increases in all cylinders, the possible cause may be（）
(1) increased scavenging air temperature
(2) air in fuel pumps and fuel valves
(3) fouling of air and gas passages
A.(1)+(2)
B.(1)+(3)
C.(2)+(3)
D.(1)+(2)+(3)
A.loss of flow in the fuel system
B.loss of pressure in the air system
C.loss of flow in the lubricating system
D.loss of pressure in the lubricating system
A.the viscosity index
B.the fuel oil contents
C.the starting speed
D.the reading at the rack
A.timing
B.power
C.firing order
D.dead center
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