Spatial data model is the core and base of three dimensional geographic information system design.
空间数据模型是地理信息系统设计的核心和基础。
Analysis of three-dimensional magnetic field is the foundation work for optimum design of electromagnetic system.
其三维磁场分析是电磁系统优化设计的基础。
Analysis of three-dimensional magnetic field is the foundation work for optimum design of electromagnetic system.
其三维磁场分析是电磁系统优化设计的基础。
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