进货时供应商必须提供产品质量保证书。
The supplier must provide quality certificate when we purchase seal material.
这些是宝钢提供的产品质量保证书，请参考！
Please find the attached Material Quality Certificate from Baosteel for your reference.
这些是宝钢提供的产品质量保证书，请参考！
Please find the attached Material Quality Certificate from Baosteel for your reference.
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