Pressing down : the lever (Robotx get help from simple machines)
by Bailey, Gerry, 1945- (Author)
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Summary
"Pressing Down explores the benefits and uses of the lever. RobbO and RobbEE learn how a lever can be formed in three different ways to do different kinds of work--lift and lower, separate, and open."-- Provided by publisher. Full description
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Other Authors
Spoor, Mike (Illustrator)
Main Language
English
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English
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