A double-layer switchable stereo liquid crystal display includes a timing controller, a microprocessor, a backlight module, a first liquid crystal panel, a controller, and a second liquid crystal panel. The fuse unit further includes a predetermined locus where fuse element portions are to be formed later. The apparatus also includes an instant key generator for temporarily generating an instant key used at all nodes in common in the tree structure, and a node key generator for generating a node key for each node by operating the node secret generated at the node secret generator and the instant key generated at the instant key generator. The substrate material is produced by sintering a compact of an aluminumsilicon carbide starting powder at a temperature not lower than 600 C. In addition, these therapeutic drugs, agents andor compounds may be utilized to promote healing, including the formation of blood clots.