current-current converter
DC Heavy Current Standard
Direct Current Standard Resistor
harmonic current standard
Standard Current Transformer
Voltage and current standard source
American National Standard
American National Standard Institute
American national standard labels
ammonia emission up to the national standard
ANSI， American National Standard Institute
biological National Standard Reference material
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