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SIMPLE MACHINES WHEELS & AXLES Simple Machines (Creative Library) Valerie Bodden CREATIVE CO2011 Library Binding English ISBN：9781608180134 A foundational look at wheels and axles, explaining how these simple machines work and describing some common examples, such as doorknobs, that have been used throughout history"ーーProvided by publisher. 洋書 Computers & Science（コンピューター＆科学） Technology
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