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What Is a Pulley? (Welcome Books: Simple Machines)

Introduces pulleys and how they work to raise flags, as well as heavy objects.

yazar:Lloyd G. Douglas
Isbn 10:0516240242
Isbn 13:978-0516240244
yayınevi:Children's Press(CT)
Tarafından gönderildi
What Is a Pulley? (Welcome Books: Simple Machines):
1 Eylül 2002