Результаты (
английский) 2:
[копия]Скопировано!
Man builds bridges for hundreds of years. The idea of construction of the first
bridge, probably arose as a result of the fall of the tree across the river.
So there was a first cantilever bridge, which is still used
forms a in Japan and India. With the help of ropes formed a sub
spring bridge, now used in Tibet. Pontoon bridges were
invented for military purposes to ferry heavy equipment
of, as well as the transport of animals and products.
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