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Why Does it Fall Over?
Jim Pipe
出版Copper Beech Books, 2002
主題Juvenile Nonfiction / Science & Nature / Experiments & Projects
ISBN07613272159780761327219
URLhttp://books.google.com.hk/books?id=OS0NAQAAMAAJ&hl=&source=gbs_api
註釋Simple text and experiments illustrate the concept of equilibrium.