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经济学 3 X171.4 2 人文地理学 2
K901.8 1 Optimization Techniques;Mathematics;Agricultural Equipment and Methods; Vegetation and Pest Control;Social Sciences;Light, Optics and Optical Devices;Water Resources;Urban and Regional Planning and Development; Control Systems 1 X171.1 1
X21 1 X820.2 1 人文、经济地理 1
地理学 1 社会学 1

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