A airplane tail section which includes: movable wing assemblies, attached to a center boom pitch assembly. The secondary amine adduct and the amine diluent react with the polyisocyanate to yield a chemically high crosslinked material having a no track time of about two minutes. The polishing state monitoring apparatus further includes a spectral data generator for reading the electrical information accumulated by the light-receiving elements and generating spectral data of the reflected light, and a processor for calculating a predetermined characteristic value on the surface of the workpiece based on the spectral data generated by the spectral data generator. The detecting and recording occur under control of hardware of the computer without software intervention. The second gate metal gate electrode has a work function corresponding to the work function of the other one of P-type silicon and N-type silicon.