gbt12496.13 1999, gbt17799.1 1999, gbt 12496.5 1999, gbt 12496.7 1999, gbt177701999, gb/t1999, gbt 11348.1 1999, GB T 11885 1999, gbt 12496.2 1999, gbt 12496.3 1999, gbt 12496.8 1999, gbt 12496.9 1999, gbt 13025.7 1999, gbt 15241.2 1999, gbt 16656.32 1999, gbt 17683.1 1999, gbt 17713 1999, gbt 17836 1999, gbt 17853 1999, GB/T 1999.
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