The Fort on Fourth Street: A Story About the Six Simple Machines

The Fort on Fourth Street: A Story About the Six Simple Machines
定價：628 元
NT $ 628
 

內容簡介

Building a fort in the backyard, a grandfather and granddaughter get help from six simple machines: lever, pulley, inclined plane, wheel and axle, screw, and wedge.
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    新書
    $628