TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The inorganic acid is nitric acid (1-35 wt.%), sulfuric acid (1-55 wt.%) and hydrochloric acid (1-50 wt.%). The strong oxidizing acid is nitric acid (0.1-70 wt.%), sulfuric acid (1-100 wt.%), mixed solution containing potassium permanganate and sulfuric acid in molar ratio of 1/100-100/1, mixed solution containing nitric acid and sulfuric acid in molar ratio of 1/100-100/1, mixed solution containing potassium permanganate and nitric acid in molar ratio of 1/100-100/1, mixed solution containing hydrogen peroxide and sulfuric acid in molar ratio of 1/100-100/1, mixed solution containing hydrogen peroxide and hydrochloric acid in molar ratio of 1/100-100/1 and mixed solution containing hydrogen peroxide and nitric acid in molar ratio of 1/100-100/1.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compounds: The diamine is ethylenediamine, poly-ethylenediamine, 1,2-propanediamine, 1,3-propanediamine, 1,2-butanediamine, 1,3-butanediamine, 1,6-hexamethylenediamine, p-phenylenediamine, cyclo hexamethylenediamine, m-phenylenediamine, m-phenyldimethylamine, diamino diphenyl methane, menthane diamine, chloro-hexamethylenediamine, chlorophenylamine, chloro-decyldiamine, dodecamethylene diamine and tri decamethylene diamine. The polyamine is triethylamine, butyl-triamine, N-aminoethylpiperazine, dicyandiamide, hexanedioic acid dihydrazide, N,N-dimethyl dipropyl triamine, pentamethyl diethylene triamine, N,N,N',N",N"-pentamethyldiethylenetriamine, tetraethenepentamine, diethenetriamine, triethylenetetramine, polythene hexamine and/or hexadene heptamine. The organic solvent is benzene, methylbenzene, dimethylbenzene, phenylethylene, butyltoluene, perchlorethylene, trichloroethylene, vinyltoluene, glycol vinyl ether, dichloromethane, carbon disulfide, triorthocresyl phosphate, methanol, ethanol, isopropanol, cyclohexane, cyclohexanone, toluene, cyclohexanone, diethyl ether, epoxypropane, acetone, methyl butanone, methyl isobutyl ketone, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, acetonitrile, pyridine, chlorobenzene, dichlorobenzene, dichloromethane, trichloromethane, carbon tetrachloride, trichloroethylene, tetrachloroethylene, trichloropropane, dichloroethane, N,N-dimethylformamide, dimethyl sulfoxide, dioxane and/or tetrahydrofuran. The condensing agent is N,N'-dicyclohexylcarbodiimide, N,N'-diisopropylcarbodiimide and/or 1-ethyl-3-dimethylaminopropyl carbodiimide.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The polyimide is thermoplastic polyimide and/or thermosetting polyimide. The carbon fiber is long fiber, fiber cloth or short fiber.