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        Potassium iodate-potassium iodide standard solution
        P-nitrobenzoic acid standard solution
        P-nitrophenol standard solution
        Nitrogen oxide standard liquid
        Diantipyrine methane standard solution
        Barium diphenylamine sulfonate saturated solution
        Anthracene standard solution 100ml
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        2.4-Xylenol standard solution 100ml
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        Cobalt dichloride standard solution 100ml
        Sodium oleate standard solution
        Sodium acetate-glacial acetic acid 0.1 mol/L 500ml
        Hydroxylamine hydrochloride standard solution
        Lead acetate standard solution 0.1 mol/L 500ml
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