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What Makes a Magnet? (Revised Ed.)

What Makes a Magnet? (Revised Ed.)

作者 : Franklyn M. Branley

出版社 : HARPERCOLLINS PUBLISHERS

※ ※ 無庫存

無庫存

定價 : NT 280

售價79折, NT221

內容簡介


Why does a magnet pick up a paper clip but not a leaf or a penny? How can the whole world be a magnet? Follow the step-by-step instructions about how to make your own magnet, and then find out for yourself what makes a magnet!
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