... 职业环境生师：Occupational Hygienist 职业分类;职类：occupational class 职业保障：professional guarantee ...
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occupational class system 划分职类制度
Relative occupational class income 相对职业阶层收入
·2,447,543篇论文数据，部分数据来源于NoteExpress
The rickshaw was an important means of transportation in all cities and towns in Republican China, and because of this rickshaw pullers formed a very large special occupational class.
人力车是民国时期各城镇中的重要交通工具，人力车夫也因此成为一个数量可观的特殊职业阶层。
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