题目内容
(请给出正确答案)
[主观题]
If due to thick and hard deposits of carbon, the piston rings cannot move freely in their
grooves, dark areas will often appear on the upper part of the cylinder wall (may not be the risible at port inspection)What condition of the piston rings can result in this phenomenon?
A.micro-seizure
B.sticking
C.scratched
D.breakage / collapse
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