Legal basis: Article 15 of the Measures for Tendering and Bidding of Construction Projects, a tenderer shall sell the tender documents or prequalification documents at the time and place specified in the tender announcement or invitation to bid. From the date of sale of the tender documents or pre-qualification documents to the date of stopping the sale, the shortest time shall not be less than five working days. A tenderer may publish the tender documents through the information network or other media, and the tender documents published through the information network or other media have the same legal effect as the written tender documents, but in case of any inconsistency, the written tender documents shall prevail. The tenderer shall keep the original written tender documents intact. Fees for bidding documents or pre-qualification documents shall be reasonable and shall not be for profit. For the random design documents, the tenderer may collect the deposit from the bidder as appropriate; If the bidder returns the design documents after the bid opening, the tenderer shall return the deposit to the bidder. Once the bidding documents or prequalification documents are sold, they will not be returned. The tenderer shall not terminate the tender without authorization after issuing the tender announcement and invitation letter, or after selling the tender documents or pre-qualification documents.