单选题A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal the probable（）Aengine overloadBleaky valvesCstuck or broken piston ringsDlow air injection pressure
单选题
A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal the probable（）
A
engine overload
B
leaky valves
C
stuck or broken piston rings
D
low air injection pressure
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