单选题Incomplete combustion in a running diesel engine can cause piston rings to become stuck as a result of （）Aresidual carbon depositsBlube oil viscosity breakdownCuneven heat expansion of the ringsDuneven heat expansion of the piston
单选题
Incomplete combustion in a running diesel engine can cause piston rings to become stuck as a result of （）
A
residual carbon deposits
B
lube oil viscosity breakdown
C
uneven heat expansion of the rings
D
uneven heat expansion of the piston
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