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小 發表於 2013-12-10 08:48 PM (第 3813 天)
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PhET Interactive Simulations, University of ColoradoPhET Interactive Simulations, University of ColoradoPhET Interactive Simulations, University of ColoradoPhET Interactive Simulations, University of ColoradoPhET Interactive Simulations, University of ColoradoPhET Interactive Simulations, University of Colorado