书籍详情
格式
精装书
页数
32
语言
英语
已发布
Sep 1, 2015
出版商
Crabtree Classics
ISBN-10
0778718905
ISBN-13
9780778718901
描述
Leo teaches his cat Pallas all about simple machines by applying his knowledge of science to their stone age world. Engaging illustrations and stories provide a fun introduction to science concepts, including wheel and axles, levers, pulleys, wedges, screws, and more. Information boxes accompany each story to explore real applications of simple machines in the natural and designed world.
类型
科学与技术