Page 48 of the second-level constructor's articles of association is invalid, and the bidding documents of the construction company only have the seal of the unit without the signature of the legal representative, which is deemed invalid by the bid evaluation committee. That's not how it is understood. Bidding documents generally require the format of bidding documents, and bidding must respond. The signature and seal of the bidder is the basic condition. Who signed it? It can be a legal representative or an authorized agent, but it must be signed. If it is only stamped and there is no signature, it can be considered as a waste bid.