The tomographic approach which basic unit is rectangular block can model and inverse the complex velocity structure.
这种层析反演方法以块体为基本单元，可以模拟和反演复杂速度结构。
According to the DISA technical design Standard and our experience, we use chocked-unchocked gating system to design the complex structure and high-strength technical system of QD90 Cylinder Block.
参照DISA工艺设计标准并结合公司以往经验，使用封闭一开放式浇注系统设计出结构复杂、高强度的QD 90缸座铸件的工艺系统。
In this paper spatial data organization structure chart of seamless GIS is advanced, the point, line, area, complex feature, DTM data and attribute merge table of block are discussed in detail.
本文给出了无缝gis空间数据组织结构图，并详细列出了图块的点、线、面、复杂要素、DTM数据以及属性拼接表的数据结构。
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