描述
How does a pulley work? What is it? Colorful diagrams and fun-to-do experiments help you explore the many ways this simple machine can help make work easier and faster.
书籍详情
格式
电子书
页数
47 页
语言
英语
已发布
Aug 23, 2011
出版商
Lerner Publishing Group
ISBN-10
1281280844
ISBN-13
9781281280848