他们如何确定原先签字或盖章的单据？
How would they establish if a document is originally signed or stamped?
本协议自双方签字或盖章完成之日起生效。
Article 12 The parties hereto have caused this agreement to be executed by signature or seal thereof.
签字或盖章的具体要求见投标人须知前附表。
For the specific requirements for the signature or seal, see the pre-attached table of instructions to bidders.
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