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531. Dynamics and Stability of Artemisia ordosica Population in S
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532. Clinical analysis of urinary tract injury in gynecologic sur
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533. Risk factors of nosocomial infections in obstetrics and gyne
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534. A Measuring Model on Tourist Satisfaction Index in Cultural
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535. 体育教育训练学硕士,postgraduates specializing in physical education a
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536. Problems Existing in the Teaching of Social Science Research
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537. Application of terahertz science and technology in biology a
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538. Environmental Safety of the Foreign Genes in Transgenic Plan
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539. Application of Data Quality Management Platform in the Inner
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540. Urinary Tract Infection in Neurosurgery:Analysis and Nurse S
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