The function of the piston compression rings used in a diesel engine is to （）<br>A:seal the space between the piston and liner<br>B:transmit heat from the piston to the cylinder liner<br>C:reduce the amount of combustion gas blow-by<br>D:all of the above

The function of the piston compression rings used in a diesel engine is to （）
A:seal the space between the piston and liner
B:transmit heat from the piston to the cylinder liner
C:reduce the amount of combustion gas blow-by
D:all of the above

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