Which of the following conditions would cause carbon deposits to form in the piston ring belt of a diesel engine?（）<br>A:faulty combustion<br>B:excessive ring temperature<br>C:over lubrication<br>D:all of the above

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

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