The valid period of certificate is two years.
证书有效期两年。
Robert: How long is the valid period of "certificate of registration"?
罗伯特：《登记证》的有效期有多长？
Article 24 the valid period of the qualification certificate for inspection and authentication institution on import and export commodities is 3 years.
第二十四条《进出口商品检验鉴定机构资格证书》有效期3年。
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