To special geometry text, exhaust from logic expression, physical expression and the realization of the system, while to attribute data mainly from the format and analysis.
对空间几何数据本文分别从逻辑表达、物理表达和系统实现加以阐述，而对属性数据则着重描述了数据格式和解析。
To special geometry text, exhaust from logic expression, physical expression and the realization of the system, while to attribute data mainly from the format and analysis.
对空间几何数据本文分别从逻辑表达、物理表达和系统实现加以阐述，而对属性数据则着重描述了数据格式和解析。
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