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。
From the point of all drainage basin flood control, to reach the optimization schedule, it requires maximum of the total pre-kept ability.
从整个流域防洪角度，要求流域内水库群的总余留防洪能力最大，以满足调度最优化的要求。
With optimization of pull cables and element sections as design variables, an optimization model and design approach for pre-stress space tress structures were obtained.
文中以拉索张力和杆件截面为设计变量，提出了预应力网架结构的优化模型，并给出了具体的优化设计步骤。
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