7295 地板工人 Floor covering installers 7301 机械技工包工头 Contractors and supervisors, mechanic trades 7302 重型设备操作包工头 Contractors and supervisors, heavy equipment operator crews 7303 印刷及相关行业主管 Supervisors, printing and related occupations 7304 铁路运输操作主管 Supervisors, railway transpor...