Legal analysis: Yes, every page should be stamped, and the qualification category should also be stamped. 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: Article 3 of the Bidding Law of People's Republic of China (PRC). The following construction projects in People's Republic of China (PRC), including engineering survey, design, construction, supervision and procurement of important equipment and materials related to engineering construction, must be subject to tender:

(a) large-scale infrastructure, public utilities and other projects related to social interests and public safety;

(2) Projects that are wholly or partially invested with state-owned funds or financed by the state;

(3) Projects that use loans or aid funds from international organizations or foreign governments.

The specific scope and scale standards of the projects listed in the preceding paragraph shall be formulated by the development planning department of the State Council in conjunction with the relevant departments of the State Council and submitted to the State Council for approval.

Where the law or the State Council has provisions on the scope of other projects that must be subject to tender, such provisions shall prevail.