The Oracle data block format is similar regardless of whether the data block contains table, index, or clustered data.
数据块的这部分包括了表和索引的数据。
CAD data are a main data source of GIS, and many problems will come forth when they are converted into GIS format, including losing block information, or point feature changed.
CAD数据作为GIS的一种主要数据源，转换为GIS格式后将出现图块信息丢失或点要素性质改变等问题。
CAD data are a main data source of GIS, and many problems will come forth when they are converted into GIS format, including losing block information, or point feature changed.
CAD数据作为GIS的一种主要数据源，转换为GIS格式后将出现图块信息丢失或点要素性质改变等问题。
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