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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
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Clogged air intake faltersB
Piston blow-byC
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Excessive piston blow-by to the manifoldB
Insufficient cooling water flowC
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Increased suction head pressureB
Decreased feedwater temperatureC
Pump recirculating line being open too muchD
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The oil oxidizes and forms carbon depositsB
The viscosity increasesC
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