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The plastics that were unknown only a few decades ago have become extremely important and widely used for construction purposes. The plastics being used nowadays possess many advantages. First of all they are extremely light and their tensile strength is greater than that of many metals. Besides, they are weather-resistant and resistant to a great number of chemical substances. Some of the examples of the constructive use of plastic materials have been domes housing radar antennae and electronic equipment. Such domes built in America and Canada are as high as 116 feet.
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The tensile strength of plastics is …
as little as that of many metals
less than that of many metals
as great as that of many metals
greater than that of many metals