Piston compression rings used in a diesel engine function to （）<br>A:transfer heat from the cylinder to the piston<br>B:scrape oil from the sides of the piston<br>C:seal the combustion space from the crankcases<br>D:prevent any piston contact with the cylinder liner

Piston compression rings used in a diesel engine function to （）
A:transfer heat from the cylinder to the piston
B:scrape oil from the sides of the piston
C:seal the combustion space from the crankcases
D:prevent any piston contact with the cylinder liner

出自：海船船员证

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