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（）<br>A:engine overload<br>B:leaky valves<br>C:stuck or broken piston rings<br>D:low air injection pressure

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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