gas content in drilling fluid
gas content in formation
low gas content coal seam
gas content in coal-bed
Chlorine Content in Coal
Sludge content in coal tar
ammonia emission up to the national standard
biological National Standard Reference material
carrying out national requirements in national defense
China National Coal Group Corp Datun Company
Chinese National standard
中国国家标准
中国国标
国家标准
茧干燥机
中国农业工程学会
Chinese National Standard CNS
discharge within controlling index of national standard
discharging without breach of the national standard