单选题A diesel engine piston ring face is in direct contact with the （）.Atop of the ring grooveBcylinder liner oil filmCbottom of the ring grooveDback of the ring groove
单选题
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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