Fichas sobre Untitled_2, creado por george123 el 29/04/2013.
|
Creado por george123
hace alrededor de 11 años
|
|
Cerrar
|
|
Creado por george123
hace alrededor de 11 años
|
|
what is healthier to drink-hard or soft water?
How is drinking water treated to make it safe?
why is distillation not used to treat mains tap drinking water?
one advantage of softening water
one advantage of hard water
what would be the consequences of not adding chlorine or flouride to tap water?
