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path of agricultural technology progress
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path of agricultural technology progress
Encyclopedia
经济学
速水-拉坦诱导性创新理论
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path of agricultural technology progress
农业技术进步道路
农业生产中先进技术对落后技术的替代方式。表现为用同样多的农业资源可以生产出更多的农产品,或者生产同样多的农产品只需要投入比以前更少的农业资源。
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tomb sculptures of Northern Song Dynasty
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tomb sculptures of Tang Dynasty
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Tombs of Chu State at Xinyang
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