(1) The relevant staff of the tendering unit should not refuse the supplementary documents of the contractor, because any formal written documents submitted by the contractor before the deadline for bidding are valid documents and an effective part of the bidding documents, that is to say, the supplementary documents and the original bidding documents * * * constitute one bidding document, not two independent bidding documents.

(2) According to the Bidding Law of People's Republic of China (PRC), the bid opening meeting shall be presided over by the tenderee (the tenderee), not by the staff of the Municipal Bidding Office.

(3) Qualification examination should be conducted before bidding (background information shows that the contractor has passed the pre-qualification), and the notary office personnel have no right to examine the contractor's qualification, and their presence is to confirm the fairness and legality of bid opening (including the legality of bidding documents).

(4) It is wrong for the notary office personnel to declare all bidding documents valid, because the contractor's bidding documents are only signed by the official seal of the unit and the project manager, and there is no seal of the legal representative or his agent, so they should be treated as invalid bidding. Even if the legal representative of the contractor entrusts the project manager to sign the contract, if there is no formal power of attorney, the bidding documents are still invalid.