A systems requirements review (SRR), preliminary design review (PDR), and critical design review (CDR).
系统需求检查(systems requirementsreview,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).
系统需求检查(systems requirementsreview,SRR)，初步设计检查(preliminary design review,PDR)，和关键设计检查(critical design review,CDR)。
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