Persistent knocking in one cylinder of a diesel engine could be caused by（）.<br>A:a low load on that cylinder<br>B:sluggish piston ring action<br>C:excessive piston crown cooling<br>D:excessive clearance of piston pin

Persistent knocking in one cylinder of a diesel engine could be caused by（）.
A:a low load on that cylinder
B:sluggish piston ring action
C:excessive piston crown cooling
D:excessive clearance of piston pin

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