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。
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