Based on IEEE standard and domestic and overseas engineering practice, the fallback system is studied in detail. The definition, function, operational principle and design specification are presented.
本文在结合IEEE标准以及国内外的工程实践的基础上，对后备系统进行了深入地研究，给出了后备系统的定义、功能、工作原理、设计要求。
Through the practice of oil exploration at Shenli oil Field, the necessity, standard and requirements of Marine geological engineering survey are discussed.
通过胜利油田浅海工程测量的实践，论述了工程测量的必要，标准及要求。
Through the practice of oil exploration at Shenli oil Field, the necessity, standard and requirements of Marine geological engineering survey are discussed.
通过胜利油田浅海工程测量的实践，论述了工程测量的必要，标准及要求。
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