描述
Ramps are simple machines used for work and play. Workers use them for easy loading and unloading. Skateboarders use them to do tricks. Readers will learn how ramps make work easier and how they are used in everyday life.
书籍详情
格式
电子书
页数
24 页
语言
英语
已发布
8月 1, 2009
出版商
Bellwether Media
版本
2 个版本
ISBN-10
1612115055
ISBN-13
9781612115054