Laser Quenching Technology and Application Analysis Laser quenching technology is the use of focused laser beam rapid heating of the surface of steel materials, so that the phase transition occurs, the formation of martensite hardened layer process. Laser ... mehr»
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 start saving humanity Gandhi lived many years in Africa and there he learned the whole art of fighting non-violently. And when he came to India in the 1920's he was a perfectly trained leader of non-violent revolution, and ... mehr» Vor 19 Jahren - von tao
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