The function of diesel engine piston compression rings is to （）.<br>A:prevent piston side thrust<br>B:prevent engine friction losses<br>C:transmit heat from the piston to the cylinder liner<br>D:remove oil from the cylinder combustion space

The function of diesel engine piston compression rings is to （）.
A:prevent piston side thrust
B:prevent engine friction losses
C:transmit heat from the piston to the cylinder liner
D:remove oil from the cylinder combustion space

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