Lever, Screw, and Inclined Plane

ISBN: 9780792259497

×÷Õß: Gare Thompson

³ö°æÉç: Natl Geographic Soc Childrens books

³ö°æÄê: 2006-9

Ò³Êý: 48

¶¨¼Û: $ 20.23

×°Ö¡: LIB

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How simple machines work and how they help us live our lives.