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出版Britannica Digital Learning, 2013-03-01
主題Juvenile Nonfiction / Technology / How Things Work-Are Made
ISBN16153597459781615359745
URLhttp://books.google.com.hk/books?id=vVWdAAAAQBAJ&hl=&source=gbs_api
EBookSAMPLE
註釋Clear definitions supported by everyday examples and easy hands-on activities introduce young scientists to wedges.