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A tyre is a circular, circular elastic rubber product that is rolled on various vehicles or mechanically. Usually mounted on a metal rim, it can support the body, cushion the impact, realize the contact with the road and guarantee the driving performance of the vehicle. Tyres are often used under the condition of complex and demanding, it when driving under various deformation, load, force and the function of the high and low temperature, so you must have high load-bearing performance, traction performance and buffer performance. At the same time, it is required to have high abrasion resistance and flexural flexibility, as well as low rolling resistance and heat resistance. Half of the world's rubber is used for tyre production, and the tyre is shown to use rubber.
The history-making earthquake and tsunami have caused the most serious nuclear accidents in Japan's Fukushima Daiichi nuclear plants ' our planet's most devastating nuclear disaster since Chernobyl and Three Mile Island. The first massive explosion and leak happened on March 12, 2011 at the Fukushima Daiichi atomic power plant. Despite all immediate efforts to cool along the reactors, reactor No.3 and three other reactors lost its ability to chill on Sunday. The fact results in three massive hydrogen explosions in Fukushima Daiichi nuclear plant, which sends enormous column of smoke in the air. An estimated of greater than 180,000 individuals have evacuated. More dangerously, the radioactive leakage has raised rays levels across the plant higher than the safety limit. 160 folks are being exposed to radiation.
Signs of birth. Since the middle of the 20th century, technology has grown faster and faster. It was only six and a half years since the discovery of uranium fission in January 1939 to the first atomic bomb exploded in July 1945. The emergence of electronic computers has led to more profound changes in the fields of human social life. These technological breakthroughs can be called technological revolutions
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