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人类社会最基本的物质生产部门。即人类通过社会劳动,对植物、动物和微生物的生长繁殖过程及其所处的环境条件进行干预,从而取得生活所必需的食物和其他物质。
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numerical invariant
numerical linear algebra
numerically controlled electrochemical contour evolution machining
numerically controlled machine tool
numerically effective divisor
numerically effective divisor; nef divisor
numerically equal
numerically equivalence
numerically equivalent
numerically equivalent cycles
numerical manifold method
numerical mathematics
numerical mesh generation
numerical method
Numerical Method for orbital evolution
numerical method for precise ephemeris
numerical method of celestial mechanics
numerical method of groundwater
numerical minimization
numerical model
numerical modeling
numerical modeling method of electrical exploration
numerical modeling of tectonics
numerical modeling of water-air two-phase flow
numerical model of Gaussian probability space
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