In a gradation display method, an image is divided into pixels having fine areas, this pixel is furthermore divided into very fine pixels having very fine areas, and then gradation is displayed based upon a ratio of a colored very fine pixel with respect to all of very fine pixels within a pixel. The acoustic signal are first windowed and filtered to produce a spectral envelope for each source. Standardizing the simulated phishing attacks for individuals from both the first and second groups is necessary in order for the performance of the first group to be fairly or meaningfully compared to the performance of the second group. The second contacts are biased such that, when the first and second vehicle components are coupled together, the second contacts are able to establish tight electrical contact with the first contacts, respectively. Polymerization takes place in the liquid until a critical polymer size is attained, whereupon a phase separation into polymer rich and solvent rich regions occurs. There are further provided guide means dictating a movement path for the counter element, such that an unscrewing movement of the ring nut will cause the engaging portion to move to a locking position relative to the ring nut thereby preventing the ring nut from unscrewing.