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 wedges make our work easier. Find out what wedges are made of and how we use wedges in our everyday life.
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格式 PDF ● 网页 24 ● ISBN 9781781214190 ● 出版者 Brown Bear Books ● 发布时间 2016 ● 下载 3 时 ● 货币 EUR ● ID 5992254 ● 复制保护 Adobe DRM
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