Each page of the original bid document must be stamped with the official seal of the bidder, and the copy can be copied. The original and the original have the same legal effect. All bidding documents requiring signature must be filled in black ink, signed by the legal representative of the bidder or its officially authorized representative and stamped with the official seal of the unit. The authorized representative of the bidder shall issue the "Power of Attorney of Legal Representative" in written form and attach it to the bidding documents.
Legal basis: Bidding Law of People's Republic of China (PRC).
Article 34 The bid opening shall be conducted in public at the same time as the deadline for submission of bid documents determined in the tender documents, and the place of bid opening shall be the place predetermined in the tender documents.
Article 35 The bid opening shall be presided over by the tenderer, and all bidders shall be invited to participate.
Article 36 When opening bids, the bidder or its elected representative shall check the sealing of the bid documents, or the staff shall open them in public after being checked, notarized and confirmed by a notary agency entrusted by the tenderer, and read out the bidder's name, bid price and other main contents of the bid documents.
All bid documents received by the tenderer before the deadline for submission of bid documents required by the tender documents shall be opened and read out in public when opening bids.
The bid opening process shall be recorded and filed for future reference.