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16、hington,DC 20001.Suggested revisions are invited and should be submitted to the Standards Department,API,200 Massachusetts Avenue,NW,Suite 1100,Washington,DC 20001,standardsapi.org.iiiContentsPage1 Scope.12 Normative References.13 Terms,Definitions,Abbreviations,and Symbols.23.1 Terms and Definitions.23.2 Abbreviations and Symbols.84 System Requirements.94.1 General.94.2 System Engineering.164.3 Safety Principles.184.4 Design Principles.184.5 Operational Principles.194.6 Barrier Philosophy and R
