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。
To make its case, RKK Energia took the unusual step - at a preliminary design stage - of ordering the construction of an experimental propulsion system.
系统需求检查(systems requirements review, SRR)，初步设计检查(preliminary design review, PDR)，和关键设计检查(critical design review, CDR)。
A systems requirements review (SRR), preliminary design review (PDR), and critical design review (CDR).
论文初步探讨了基于GIS的青海省地质灾害管理信息系统设计和实现。
The paper mainly discusses the design and implementation of Qinghai Geological Hazards Management Information System based on GIS.
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