Either a low injection pressure or a leakage of piston rings is able to lead （）.<br>A:a high exhaust temperature<br>B:a high smoky exhaust<br>C:a high output<br>D:a high compression

Either a low injection pressure or a leakage of piston rings is able to lead （）.
A:a high exhaust temperature
B:a high smoky exhaust
C:a high output
D:a high compression

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