In a motor vehicle with a roof opening located in a fixed roof surface and a cover for closing the roof opening, the cover has an at least partially transparent pane and a frame which is connected to the pane and which extends over at least one part of the edge of the pane. Methane is converted into syngas which is converted into a low-sulfur liquid hydrocarbon mixture containing less than 1 ppm sulfur via Fischer-Tropsch syntheses. Moving a pair of conductive plates by electrostatic attraction has low power consumption and can operate at very high speeds. The RFID tag then transfers the component information and power to active label device to enable it to form and display indicia representative of the component information. The above-mentioned method peels off the silicon nitride layer after the growth of the field oxide layer is finished, at this time, the length of a bird beak of field-oxide can be optimized by adjusting a wet-dipping amount to solve the problem that the bird beak of field-oxide is too long.