This invention discloses a printing quality inspection apparatus including a light irradiation device, an image capture device, a diffusely reflecting plate, and a determination device. Methods are also disclosed which permit a compound library to be rapidly screened to determine if any members of the library have a higher affinity for the target receptor relative to a pre-selected indicator compound. The DeNB receives an acknowledgment message sent by the RN in FDD mode. The first extrusion layer and the conductor plane are made of the same material.