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[1]-[J].Journal of Zhengzhou University (Engineering Science),1987,8(03):86-90.

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 8卷 Number of periods: 1987 03 Page number: 86-90 Column: Public date: 1987-09-01

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