rural patriotic hygiene work
integrated technique of indoor work and field work
integration of Indoor work and field work
maximum difference work between plus and minus work
stay at a selected grass-roots unit to help improve its work and gain firsthand experience for guiding overall work
work center capacity report-by work center
work center load analysis by work center
work list by work center
work system of work safety
Ambassador of Hygiene Scheme
American Industrial Hygiene Association
animal derived food hygiene
animal environmental hygiene
Bacteria in food hygiene