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Single screw pump working principle The single screw pump is a rotor type positive displacement p ......
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A resin obtained by polycondensation of phenols (mainly phenol, resorcin, cresol) with formald ......
Harry Brearley, a famous metallurgical scientist who graduated from the University of Sheffiel ......
It is entirely natural, natural materials and refreshing green make us comfortable, as if re-cast ......
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The 2012 UN Climate Conference was held in Doha as scheduled, and the venue was selected a ......