This research is a survey research, the Department cut with the purpose to study the factors associated with the occurrence of symptoms of respiratory system of workers perform grass flower broom Khok gravel Phli district, Nakhon Nayok.
This research is a survey research, the Department cut with the purpose to study the factors associated with the occurrence of symptoms of respiratory system of workers perform grass flower broom Khok gravel Phli district, Nakhon Nayok.