There are two compression rings for the piston group which guarantees good sealing performance and accurate valve timing.
活塞组采用两道压缩环，密封能力强、配气定时准确；
Piston group is one of the diesel engine parts that works in the worst condition.
活塞组是柴油机中工作条件最苛刻的零件之一。
Piston group is one of the diesel engine parts that works in the worst condition.
活塞组是柴油机中工作条件最苛刻的零件之一。
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