C-09-Q190mediumsingle_mcq
To prevent acid rain caused by gases emitted from the brick-field industry, what should be done?
To prevent acid rain caused by gases emitted from the brick-field industry, what should be done?
- aRefining coal to remove nitrogen and sulfur
- bKeeping the pH value of fuel above 7
- cUsing sulfur dioxide in fuel
- dUsing a large amount of limestone in the fuel