The rod pumping is the predominance mechanical recovery mode in world petroleum production, the system dynamical simulation is the base of system efficiency analysis and optimum design.
有杆泵抽油是世界采油工程中一直占主导地位的机械采油方式，系统动态模拟是系统效率分析和优化设计的基础。
Differing from the management information system, GIS can simulate the real world, do some spatial query or analysis and do some forecast by computer technology.
与管理信息系统不同，它可以利用计算机技术模拟现实世界，进行各种空间查询、空间分析以及模拟预测。
From the above analysis shows that the foundation of the world tax planning is the difference between the national tax system.
从上述的剖析可见，世界税务谋划的根底就是各国税制的区别。
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