An aircraft has a fuselage, one or more propellers and a main wing. A part of the surface of the object including the concavity is extracted. Noted that the protector formed on the organic compound layer has a transmittance of 70-100%, and the damage given to the organic compound layer when the anode is formed by a sputtering method can be prevented. The tool may be manipulated from above ground. In the dripping mode, the pump is alone actuated to dispense the liquid composition absent electrostatic charge. Else, if a copy of a data block that is to be recovered is stored on a surviving node in the cluster, then one or more redo records are applied to that copy.