Selection of steel doors and Windows must be to dealers for product quality inspection certificate.
选择好塑钢门窗后一定要向经销商索要产品质量检验合格证明。
Product quality supervision and inspection certificate, the standard implementation of the certificate.
产品质量监督检查合格证书，标准执行证书。
Pipe quality of certificate is an important document of enterpriser to issue product quality certification to end user.
钢管质量证明书是企业为用户出具产品质量保证的重要文件。
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