If no custom document model is supplied as index parameter, Net Search Extender USES its default document model.
如果没有通过索引参数提供定制的文档模型，那么Net Search Extender使用它的默认模型。
It is a first class entity in the meta-model of SimpleRDB, but it has no equivalent in UML 2.0. That is why the signature of the relation has no formal parameter that relates a UML element.
它是SimpleRDB的通用模型的第一个类实体，但是在UML 2.0中没有它的对等体。这就是关联的签名没有与uml元素相关的形式参数的原因。
A model of the no steady process of gas jet interaction with liquid is developed and solved by the commercial software FLUENT. The change law of parameter in the flow field has been obtained.
建立含能气体射流与液体工质相互作用非稳态过程的理论模型，应用fluent应用软件对非稳态气体射流与液体工质相互作用的过程进行了模拟，获得了射流流场中各参数的变化规律。
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