单选题Diesel engine exhaust temperatures may be used to indicate （）.Aleaking exhaust valvesBan overloaded cylinderCa clogged injector nozzleDall of the above
单选题
Diesel engine exhaust temperatures may be used to indicate （）.
A
leaking exhaust valves
B
an overloaded cylinder
C
a clogged injector nozzle
D
all of the above
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