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“Welder” magazine is the national core journals in China, the source journal of Chinese science and technology papers (China science and technology core journals), “Chinese core journals database” included journals, “” British “scientific abstracts” (INSPEC) “Digest Magazine” includes periodicals “” The United States “Cambridge Science Digest” (CSA) contains periodicals “” Poland Copernicus Index (IC) "included periodicals and so on. Post offices can subscribe around, postal code: 62-81, price: 10 yuan / month, 120 yuan / year. Tel: 028-83267908 Contact: Huang Xiuyan E-mail: bj@toweld.com