An L-shaped platform having a vertical bale gripping frame and a horizontal bale support deck is mounted on a transport vehicle for rotation through 90\xb0 from a transport position to a bale pick-up position. The activity data is captured over time. In particular, the spraying component distributes the incoming packets based on queue lengths associated with the packet processing engines and based on a random component. An external contact element of this type improves the possibilities of a soldering connection to circuit carriers of superordinate circuits. By using multiple pairs of PCR specific primers directing to the SNP loci of multiple rare blood types, the SNP loci of multiple rare blood types are simultaneously detected in the same PCR reaction system; and the multiplex PCR detection method and a Pool detection method are combined to rapidly screen the human rare blood types.