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491. An Empirical Study on the Psychology and Behaviors of Online
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492. The Construction and Practice on Human Geography and urban-r
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493. THE STUDY ON DYNAMICS MODELLING ANDC ONTROL OF FLEXIBLE MECH
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494. The Secondary Development of Site Search Based on Common Sea
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495. A Cross-sectional Study on Psychological and Behavioral Prob
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496. Quantitative Assessment of the Effect on the Eco-environment
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497. Discussion on training mode of full-time professional gradua
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498. Assessment on Economic-Environmental Efficiency of China s I
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499. Analysis on Hospital Deaths in Patients with Road Traffic Tr
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500. Effects of road network on landscape ecological risk:A case
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