A diesel engine piston ring face is in direct contact with the （）.<br>A:top of the ring groove<br>B:cylinder liner oil film<br>C:bottom of the ring groove<br>D:back of the ring groove

A diesel engine piston ring face is in direct contact with the （）.
A:top of the ring groove
B:cylinder liner oil film
C:bottom of the ring groove
D:back of the ring groove

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