The reinforced concrete constructions of prefabricated tend to move from "a" as being in common use today as "columns" to increase the stability and ease of repair when there is trouble. With the developed countries, because of the economic conditions should the former not reinforced structures make sure weight is peeling off, replaced by thicker, heavier structures. Figure 1.2 demonstrate comparison between protective constructions of roof structure and previous levees are new changes in a section of the dike in the Netherlands
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