Home / Standards / GB/T 12331-1990 GB/T 12331-1990 Abolished Classified standard of operation with exposure to toxic chemicals in the workplace 有毒作业分级 Standard Type GBT ICS 13.100 CCS C70 Status 废止 Issue Date 1990-04-23 Implementation 1991-01-01 Responsible Dept 国家卫生健康委 Drafting Unit N/A