Our certificates are made valid with the official seal.

我们的证明书以盖公章有效。

Please stamp here with the official seal of your company.

请在此处盖上公司的公章。

Because there is no official seal of, only the signatures.

因为没有公章的，只有签名。

Our quality certificate is made valid by means of official seal.

我们的质量证书盖了公章方为有效。

The official seal of the importer shall be affixed to the aforesaid photocopies.

上述各类复印件应当加盖进口单位公章。