An exhaust gas cleaning system has two catalysts and three sensors. Each of two sides of a long sheet of the track is extended with a strip for retaining a drawable box. A method for projecting an image is also provided.
Algorithmically generated prior art
An exhaust gas cleaning system has two catalysts and three sensors. Each of two sides of a long sheet of the track is extended with a strip for retaining a drawable box. A method for projecting an image is also provided.