File:Balance.pngDescriptionBalance.png 中文:用来展示稳定平衡、不稳定平衡和随遇平衡。 English: Used to escribe those three kinds of balance. Date 2 August 2009 Source Own work Author Dzlot
File:Balance.PNGDescriptionBalance.PNG English: Drawn by Theresa Knott Date 2 July 2005 (original upload date) Source Transferred from en.wikibooks to Commons. Author
File:Roberval balance simple.png converted File:Roberval balance.jpg to 16-color .png (4 colors used) Anthony717 at the English-language Wikipedia, the copyright holder of this work