Exhaust temperature increases in all cylinders, the possible

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[单选题]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)

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[单选题]Factor influencing the position of the interface between the liquid seal and the oil in a purifier is （）.

A. throughput
B. back pressure
C. gravity disc
D. None of the above is wrong

[单选题]The viscosity regulator controls the （） of the fuel oil in order to provide the oil at the correct viscosity for combustion.

A. temperature
B. pumping rate
C. pressure
D. heat

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