A method of automatically testing and verifying power management features of a computer system in different modes including Standby, Hibernate, Shutdown, and Reboot is disclosed. At least one coupler further includes a coupling direction changing mechanism which couples the at least one coupler with a predetermined position of a structural member corresponding thereto so that the center line of the body of the at least one coupler can be orientated in a desired direction. The barrier layer defines in part a plurality of fluid channels and the plurality of ejection chambers. Both ends of the linear semiconductor layers are connected to first and second IO terminals of the switch, respectively. The invention further relates to the preparation of the addition compounds and to their use as dispersants, wetting agents and dispersion stabilizers, and also to solids coated with the addition compounds. As a result, an alumina-based abrasive grain which is highly dense, has a high hardness, and exhibits a high purity may be manufactured using boehmite powder and activated alumina powder.