Les roulements
(http://img4.hostingpics.net/pics/37651016r3.jpg)
(http://img4.hostingpics.net/pics/21250555r2.jpg)
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http://www.mediafire.com/download/vi8d18ft9za69td/roulements_activite_2.rar
http://www.mediafire.com/download/mwj3zae8eyeeb0m/roulement_activite_3.rar