Del cemento al puente (From Cement to Bridge)

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ediciones Lerner, Aug 1, 2006 - Juvenile Nonfiction - 24 pages
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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.
 

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Contents

Se mezcla el cemento
4
Los obreros preparan el terreno
6
Se construyen los encofrados
8
Se construyen los extremos
10
Se construyen las patas
12
Una Máquina coloca las vigas
14
Se colocan las varillas
16
Los obreros hacen el tablero del puente
18
Se ponen vallas y faroles
20
Los autos cruzan el puente
22
GlosarioÍndice
24
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