What is the difference between the "original" and the "copy" of the tender document? What do I need to pay attention to in the production of what matters, what are the requirements?

The bidding time if you say you have a mistake somewhere, then no matter right or wrong to the original as the basis, so the original must ensure that there is no error! The difference between the original and the copy is that the cover is different, the other content is the same, the original alone in a file bag, and the copy is unified in a file bag!