ITU-T E.521
Calculation of the number of circuits in a group carrying overflow traffic
现行
发布日期 :
2025-11-01
实施日期 :
ITU-T X.521
Information technology - Open Systems Interconnection - The Directory: Selected object classes
现行
发布日期 :
2029-08-01
实施日期 :
ITU-T T.521
Communication application profile BT0 for document bulk transfer based on the session service
现行
发布日期 :
2011-11-01
实施日期 :
API 521 specifies requirements and gives guidelines for examining the principal causes of overpressure; determining individual relieving rates; and selecting and designing disposal systems, including such component parts as piping, vessels, flares, and vent stacks. This Standard does not apply to direct-fired steam boilers.
ISO 8835-4:2004 EN 521b0ebb
Inhalational anaesthesia systems — Part 4: Anaesthetic vapour delivery devices
废止
发布日期 :
2004-06-03
实施日期 :
ISO 3324-1:1997 EN e521b5e0
Aircraft tyres and rims — Part 1: Specifications
废止
发布日期 :
1997-12-25
实施日期 :