Like other dusts, coal dust mainly enters the human body through the respiratory tract, followed by skin contact, and part of the dust can be swallowed into the digestive tract when dissolved in oral saliva or adhered to food
Coal dust, like other dust, enters the body mainly through the respiratory tract, followed by skin contact, some of which dissolves in oral saliva or adheres to food and can also be swallowed into the digestive tract
Coal dust, like other dusts, mainly enters the human body through the respiratory tract, followed by skin contact. Some dust dissolves in oral saliva or adheres to food and can also be swallowed into the digestive tract<br>