A.Blasting the surface with abrasive material
B.Blasting the surface with air only
C.Blasting the surface with sand
D.Blasting the surface with oil
E.None of the above
A.Blasting the surface with abrasive material
B.Blasting the surface with air only
C.Blasting the surface with sand
D.Blasting the surface with oil
E.None of the above