How is a bridge built? Cement is mixed with water and rocks to make concrete. The concrete is poured into holes and into blocks that are stacked to make a bridge. Once fences and lights are added to the bridge, cars can drive across it.
Langue Espagnol ● Format PDF ● ISBN 9780822572022 ● Maison d’édition Lerner Publishing Group ● Publié 2006 ● Téléchargeable 3 fois ● Devise EUR ● ID 5846036 ● Protection contre la copie Adobe DRM
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