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.
全部产品都有国际认可的产品质量保证书，优质的产品会让客户满意和放心。
All products are internationally recognized quality assurance of the products, high-quality products and customer satisfaction will be assured.
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