A semiconductor device including a plurality of solder balls on a surface the semiconductor device, and a retaining body associated with a first solder ball of the plurality of solder balls, separating the first solder ball from at least a second solder ball of the plurality of solder balls. A detection-signal input terminal is provided at a position where it contacts the liquid. A block diagram showing functions of at least one of the signal processing and the mixing processing is displayed. Each subset includes a plurality of memory cells. The difference in voltage between the differential read bit lines is sensed to determine the value stored in each 8-transistor SRAM storage cell and complete the read operation. The retraction mechanism is configured to facilitate moving the stopper away from the applicator.