Does each page of the original bid document need to be stamped? Does the copy also have this requirement?

The original bidding documents are required to be stamped on each page of the bidder's official seal, a copy of the original can be copied and the original has the same legal effect. Bidding documents require a signature must be filled out in black ink, and signed by the bidder's legal representative or his duly authorized representative and stamped with the official seal. Authorized representative of the bidder must be issued in writing "legal representative power of attorney" attached to the tender documents.