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Keywords:
JB 1612-1983, JB/T 1612-1983, JBT 1612-1983, JB1612-1983, JB 1612, JB1612, JB/T1612-1983, JB/T 1612, JB/T1612, JBT1612-1983, JBT 1612, JBT1612