Предмет: География, автор: CholponD

какие растения растут в северной америке?

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Автор ответа: gikamagilka

В СЕВЕРНОЙ АМЕРЕКЕ МНОГО ЛЕСО ЭТО ТОЛЬКО В ЮЖНОЙ ЧАСТИ А НА СЕВЕРЕ ТАЙГА РАСТЕНИЯ ЯШМЕНЬ ТУРГУЗ НУ И ВСЕ БОЛЬШЕ НЕЗНАЮ

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The most important metal in industry is iron and its alloy — steel. Steel is an alloy of iron and carbon. It is strong and stiff, but corrodes easily through rusting, although stainless and other special steels resist corrosion. The amount of carbon in a steel influences its properties considerably. Steels of low carbon content (mild steels) are quite ductile and are used in the manufacture of sheet iron, wire, and pipes. Medium-carbon steels containing from 0.2 to 0.4 per cent carbon are tougher and stronger and are used as structural steels. Both mild and medium-carbon steels are suitable for forging and welding. High-carbon steels contain from 0.4 to 1.5 per cent carbon, are hard and brittle and are used in cutting tools, surgical instruments, razor blades and springs. Tool steel, also called silver steel, contains about 1 per cent carbon and is strengthened and toughened by quenching and tempering.

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