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[1]-[J].Journal of Zhengzhou University (Engineering Science),1989,10(03):110-112.

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 10卷 Number of periods: 1989 03 Page number: 110-112 Column: Public date: 1989-09-01

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