Blow-off of the relief valves of the main cylinders during operation indicates （）.<br>A:the cylinder cover is cracked<br>B:the injector holes is clogged<br>C:the cams are not properly set<br>D:fuel pump is leaking

Blow-off of the relief valves of the main cylinders during operation indicates （）.
A:the cylinder cover is cracked
B:the injector holes is clogged
C:the cams are not properly set
D:fuel pump is leaking

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