The 3 tables in QB1 are joined with nested loop join (NLJ).

QB 1中三个表用嵌套循环(NLJ)连接。

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Mainly it discusses two problems: software instruments of viscosity and flash point using neural networks and operation optimization on the atmospheric and vacuum towers using NLJ method.

主要探讨了两个方面的问题：采用神经网络建立各个侧线粘度和闪点的软测量仪表以及采用NLJ方法实现常减压塔的操作优化。

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