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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 20 Number of periods: 1999 No.02 Page number: 39-41 Column: Public date: 1999-01-01

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DOI:: 10.3969/j.issn.1671-6833.1999.02.013

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Last Update: 1900-01-01