单选题Which of the following conditions would cause carbon deposits to form in the piston ring belt of a diesel engine?（）Afaulty combustionBexcessive ring temperatureCover lubricationDall of the above
单选题
Which of the following conditions would cause carbon deposits to form in the piston ring belt of a diesel engine?（）
A
faulty combustion
B
excessive ring temperature
C
over lubrication
D
all of the above
参考解析
解析：
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