National Occupational Classification 职业分类表 ; 国家职业分类 ; 全国职业分类 ; 国家职业分类表

census occupational classification 职业分类人口调查

Standard Occupational Classification System 标准职业分类体系

Standard Occupational Classification 标准职业分类

System of Occupational Classification 职业分类体系

Common Classification of Occupational Groups 职业类共同分类法