Some uses of water are listed.
1- for drinking
2- in chemical reactions
3- in swimming pools
4- in washing
For which uses is it necessary to chlorinate the water?
1 )
1 and 2
1 and 3
3 )
2 and 4
4 )
3 and 4
تحلیل ویدئویی تست
تحلیل ویدئویی برای این تست ثبت نشده است!