توضیحات
Pulleys are simple machines used to lift and move loads. Builders use pulley systems to lift tools or materials up high and elevators go up and down with the help of pulleys. Kids will learn how pulleys make work easier and how they are often part of complex machines.
جزئیات کتاب
فرمت
کتاب الکترونیکی
صفحات
25 صفحه
زبان
انگلیسی
منتشر شده
اوت 1, 2009
ناشر
Bellwether Media
نسخهها
2 نسخه
ISBN-10
1612115047
ISBN-13
9781612115047