A virtual ejection port is selected by assigning virtual ejection ports to the virtual N ejection ports, then an ejection port of the apparatus is selected for output, and, in response to the entry of a print job designated for output to the virtual ejection port, the ejection port of the apparatus is determined by correlating the virtual ejection port with the ejection port of the apparatus. FET and charge storage transistor gate stacks may be formed. The medium petrol pipeline is connected with a medium petrol extractor, the upper part of the medium petrol extractor is connected with the medium petrol raffinate oil hydrogenation unit through the pipeline, the lower part of the medium petrol extractor is connected with the medium petrol aromatic hydrocarbon hydrogenation unit through the pipeline. The ambient temperature Ta is observed by a temperature sensor, and a thermal conductivity sensor measures the thermal conductivity of the gas at two different temperatures above the ambient temperature. The exhaust gas treatment unit is characterised in that the catalyst also contains, in addition to SCR components, at least one storage component for nitrogen oxides. The back sheet has a removable panel disposed over the label shape adhesive material and a registration tab aligned with the label shape.