喜羊羊 发表于 2010-11-2 10:29

视频: 手工电弧焊安全技术2010

http://player.youku.com/player.php/sid/XMjE5Mzk3MjEy/v.swf

lijianhui8441 发表于 2012-4-23 16:12

xuexi ,kanbuliao shi pin
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