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出版Capstone, 2000-09
主題Juvenile Nonfiction / Technology / Machinery & ToolsJuvenile Nonfiction / Science & Nature / Physics
ISBN07368494839780736849487
URLhttp://books.google.com.hk/books?id=QPcgrQSPaswC&hl=&source=gbs_api
EBookSAMPLE
註釋Uses everyday examples to show how screws are simple machines that make joining things together, moving, and lifting easier.