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With the development of human science, environment and development problems have been a global focus. From the 1950s', how to handle medical junk has been paid close attention all over the world. In(More)
In Han Dynasty, the literary style of Fu has developed lushly. Among so many writings of Han-fu, the writings of describing the privacy theme present special styles and features. And the privacy-fu(More)
During the corrugated tube heat exchanger design process,corrugated tube is usually treated as straight tube with same size, and tubesheet strength analysis is performed by the method given in GB(More)