单选题Either a low injection pressure or a leakage of piston rings is able to lead （）.Aa high exhaust temperatureBa high smoky exhaustCa high outputDa high compression
单选题
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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