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子子61961 发表于 2012-6-9 15:45 2 s6 }5 T- H: }
既然是液压油,那就是有汽缸和活塞,
& ^9 h0 c, u1 U0 G3 E: e1 ?那么活塞和汽缸的之间肯定是有缝隙的,# ?7 C* ` i$ @9 s% T( [
缝隙肯定是用密封材料来密封 ...
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