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.
भाषा स्पेनिश ● स्वरूप PDF ● ISBN 9780822572022 ● प्रकाशक Lerner Publishing Group ● प्रकाशित 2006 ● डाउनलोड करने योग्य 3 बार ● मुद्रा EUR ● आईडी 5846036 ● कॉपी सुरक्षा Adobe DRM
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