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从空间数据库中标识一个地理目标子集的过程。被标识的目标必须满足特定的语义与空间关系准则。又称空间检索、空间数据选取。
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variational theorem
variational theory
variational transition-state theory
variational translation
Variational Translation Theory
variation between laboratories
variation calculus
variation centre
variation coefficient
variationcoefficient of orebody
variation curve
variation form
variation in sign
variation limiting matrix
variation method
variation of a charge
variation of a function
variation of a functional
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variation of argument
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variation of a set
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