Appraisement methods, which means giving the appraisal of railway construction organization variant, is an important component part of design document at the preliminary design stage.
铁路施工组织方案比选，是铁路初步设计阶段设计文件的重要组成部分。
In this module, we will examine some tools that will help to evaluate the operability of the candidate process at the preliminary design stage, before substantial effort has been invested.
在这个模块里，我们将考查一些工具。这些工具在实质的努力投入之前，对初步设计阶段的候选过程的可操作性的评估很有帮助。
To make its case, RKK Energia took the unusual step - at a preliminary design stage - of ordering the construction of an experimental propulsion system.
为了证明自己的设计有道理，安吉亚太空公司走了非同寻常的一步：在初步设计阶段，定制建设了试验性的推进系统。
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