The main function of piston compression rings is to （）<br>A:prevent excessive cylinder liner wear<br>B:reduce friction losses in the engine<br>C:seal the space between the piston and the liner<br>D:limit upward flow of lube oil into the combustion space

The main function of piston compression rings is to （）
A:prevent excessive cylinder liner wear
B:reduce friction losses in the engine
C:seal the space between the piston and the liner
D:limit upward flow of lube oil into the combustion space

出自：海船船员证

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