The management categories of CNPC's supplies include primary material suppliers and secondary material suppliers.
中国石油物资供应商的管理类别包括一级采购物资供应商和二级采购物资供应商。
The management categories of CNPC's supplies include primary material suppliers and secondary material suppliers.
中国石油物资供应商的管理类别包括一级采购物资供应商和二级采购物资供应商。
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