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.
Limba Engleză ● Format PDF ● ISBN 9781575058115 ● Editura Lerner Publishing Group ● Publicat 2004 ● Descărcabil 3 ori ● Valută EUR ● ID 4770717 ● Protecție împotriva copiilor Adobe DRM
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