书籍详情
格式
Kindle
页数
24
语言
英语
已发布
Jan 1, 2014
出版商
The Child's World
ISBN-10
1631431323
ISBN-13
9781631431326
描述
Readers learn how this simple machine makes it easier to keep objects locked together. By the end of the book, readers know the difference between complex and simple machines and how screws are used in everyday life to make work easier.