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life20112011:[表情] 我来解答你的问题:1:pack off:密封4“冲管和延伸筒环空2:po pulling,应该是pack off pulling tool,防砂完毕后用来回收pack off3:two way :全称是two way shifting tool,用来开关防砂充填滑套4:one way:全称是one way closing tool,用来关闭防砂充填滑套... .. (2011-11-25 21:17)
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