The nominal head was presented for preliminary selection of hydraulic models, with consideration of the efficiency and reliability at all operation conditions.
为了兼顾各种特征扬程工况下的运行效率和可靠性，在水力模型初选阶段提出了选型名义扬程的概念。
Jeff: I was told that with the increasing Numbers of the participants, they started to undertake preliminary selection contest in each continent, the winners could take part in the final.
杰夫：我听说过，此后随着参赛国家数量的不断增多，便开始在各大洲进行分区预选赛，优胜者参加最后的决赛。
Usually some hypothesis is a necessary preliminary to the collection of facts, since the selection of facts demands some way of determining relevance.
通常，有某种的假说是收集事实的必要先决条件，因为在对事实的选择上，要求有某种方法确定事实是否与题有关。
Through analyzing the preliminary design scheme of original water conveyance project, this paper makes comparison and selection of several schemes, and determines the water conveyance scheme.
通过对原输水工程初步设计方案的分析，对多个方案进行了比选，并确定了输水方案。
The preliminary experiment results show that the device selection and technique approach are suitable for the neutron imaging system, achieving the research goal.
结果显示，相对灵敏度的模拟与实验结果符合得很好，而中子成像模拟能为惯性约束聚变物理实验的开展提供指导。
The preliminary experiment results show that the device selection and technique approach are suitable for the neutron imaging system, achieving the research goal.
结果显示，相对灵敏度的模拟与实验结果符合得很好，而中子成像模拟能为惯性约束聚变物理实验的开展提供指导。
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