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Gear machining 2 - machining Gear machining 2 - mach...
作者：wencong
发布：2014-09-24
播放：59
Metal cutting Basics - mechanical manufacturing process on the basis Metal cutting Basics - ...
作者：wencong
发布：2014-07-07
播放：74
Welding and gas cutting - machinery manufacturing technology base Welding and gas cutting...
作者：wencong
发布：2014-07-07
播放：38

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