Face plates 11 and 12 of a hollow shape member 10 are abutted against face plates 21 and 22 of a hollow shape member 20. The program detail information display apparatus can enhance the efficiency of selection of programs by the viewer. A rotatable adjusting knob is pivotably connected to the rear end of the positioning plate and controls the movement of the positioning plate so as to adjust the depth of feeding of the screws. The high current density is possible since under certain voltage drop across the dielectric layer, effective negative electron affinity is realized for the quasi-equilibrium \u201ccold\u201d electrons accumulated in the depletion layer in the p-region next to the dielectric layer. The bioreactor system can be controlled andor monitored by a controller that can individually identify and control each connected module and that can be adapted to collect signal data from sensors embedded in any of the modules. A main printed circuit board 10 and a sub board 17 are composite-molded, and the sub board 17 is formed at an area close to or immediately below a heat-generating electronic component 23 or a heat dissipation plate 23a.