We use machines every day. This series explores the six types of simple machines that people have used throughout history. Stunning photos, clear text, and simple activities bring the topic to life. Simple machines called pulleys make our work easier. Find out about the different parts of a pulley and how we use pulleys in our everyday life.
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格式 PDF ● 网页 24 ● ISBN 9781781214169 ● 出版者 Brown Bear Books ● 发布时间 2016 ● 下载 3 时 ● 货币 EUR ● ID 5992251 ● 复制保护 Adobe DRM
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