NSRDS National Standard Reference Data System
biological National Standard Reference material
national reference standard
National Standard Reference Materials
National Standard Reference stream sediment sample
national standard system
elemental standard data system
office of standard reference data
Bell system reference system
American National Standard
American National Standard Institute
American national standard labels
ammonia emission up to the national standard
ANSI， American National Standard Institute
Chinese National standard
中国国标
茧干燥机
中国国家标准
中国农业工程学会
国家标准
Chinese National Standard CNS
Chinese national standard code by section-position
Chinese national standard code for information int
Chinese national standard code for information interchange