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Keywords:
JB/T 2639-1993, JB 2639-1993, JBT 2639-1993, JB/T2639-1993, JB/T 2639, JB/T2639, JB2639-1993, JB 2639, JB2639, JBT2639-1993, JBT 2639, JBT2639