1. A copy of the tender may be a copy of the original. Of course, complete copying is not necessary. For example, samples, drawings and other complete sets of documents issued directly or together with the original. According to the requirements of the tenderer, the bidding documents submitted by the bidder are generally original and copy.

2. The original must be signed and sealed by the bidding representative, and the copy can be a copy of the original or the original, but the word "copy" must be marked on the cover of the tender.

3. The contents of the original and the copy must be the same. If the contents are different, the original shall prevail. No matter how copies are compiled, the original bidding documents shall prevail.

4. There is no essential difference between the original and the copy in actual operation, only the cover indicates the difference.

In bidding, there is no requirement that the copy must be stamped with a red seal and signed in person. However, if there is such a requirement in the tender documents, it is best to do it according to the requirements, so as not to waste the tender.

By the same token, it is better to consult the tendering company or implement the terms that are not clearly stipulated in other laws or understood by yourself.