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 passagesA(1)+(2)B(1)+(3)C(2)+(3)D(1)+(2)+(3)
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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