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.
Bahasa Inggris ● Format PDF ● ISBN 9781575058115 ● Penerbit Lerner Publishing Group ● Diterbitkan 2004 ● Diunduh 3 kali ● Mata uang EUR ● ID 4770717 ● Perlindungan salinan Adobe DRM
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