优化的第一步称为预优化(pre-optimization)，如果查询语句很简单，最有效的执行计划显而易见，查询优化器将直接在这一步结束优化，得到优化结果，从而避免了更多的资源消耗...
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In the pre-optimization, not only the number of equipment operation at one point of time but also the number of operations during a whole day can be calculated.
在预优化中，可以同时算出每个时间点的动作设备数以及全天的动作总数。
参考来源 - 地区电网无功电压优化控制系统的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
The method of manifesting latent handprint with tetramethylbenzidine is optimized in work practice, which results in different manifestation effect compared with that of pre-optimization.
对四甲基联苯胺显现潜血手印在实际工作中遇到的不足进行了优化，结合案例，运用比较的方法说明优化前后显现效果的不同。
Two categories of APC pre estimation methods are presented with examples relating to refining issues in this connection: statistical rules and the steady state gain optimization method.
为此列举炼油装置的示例，介绍了两类预估先进控制经济效益的方法，即统计分析法和静态增益优化法。
These situations are formulated as the module placement with pre-placed modules. For solving the problem, the methods used are usually stochastic optimization placement algorithm.
此类问题能被形式化为带有预放置模块的布局问题，关于此问题的求解方法多为随机优化方法。
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