Incomplete combustion in a running diesel engine can cause piston rings to become stuck as a result of （）<br>A:residual carbon deposits<br>B:lube oil viscosity breakdown<br>C:uneven heat expansion of the rings<br>D:uneven heat expansion of the piston

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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