English Surface_roughness roughness parameters Roughness Average roughness parameters English English historicamente mais usada é o Ra surface roughness Roughness Average Ra English roughness English surface roughness rough English surface roughness surface roughness roughness roughness parameters Surface roughness Ra rough roughness (Ra) Surface roughness surface roughness http://en.wikipedia.org/wiki/Surface_roughness Roughness Average topographic roughness English Roughness Ra Surface Roughness rough surface roughness Surface roughness surface roughness surface roughness roughness parameters surface roughness Ra roughness surface roughness English Surface Roughness Average roughness surface roughness surface roughness English http://en.wikipedia.org/wiki/Surface_roughness roughness parameters surface roughness roughness Surface roughness surface roughness Surface Roughness Average Surface roughness roughness roughness Surface roughness surface roughness surface roughness surface roughness roughness Ra