The purpose of the AB part of the college entrance examination question is to achieve different answers to the same question (option order), so that cheaters can't start and prevent cheating to the greatest extent.
The same exam, the content of the exam can not be completely different. The difference here mainly refers to the method of using dislocation arrangement, the number of artificial theme papers, the arrangement of selected articles and the layout style. Therefore, different papers should be in the same place as far as possible to realize qid, and the answers are different, "more than one volume", which is further deepened on the basis of A and B.
In order to prevent students from copying each other's papers in the same place, the content of the exam is the same, and the order of the big questions is the same, but the order of the answers is different from that of the multiple-choice questions. Cheating can be prevented by disrupting the order of questions in the same set of test papers (qid dislocation method) or the order of question options (selection dislocation method).
Extended data:
The method of title dislocation:
When arranging problems, don't emphasize the order of difficulty and disrupt the priority order.
For example, if you put the first question of the fourth question, the correct answers are A, B, C and D. If you put the first question of the fourth question, the number of each question will change, and the order of the answers will become D, A, B and C, so the answers of two papers with the same number of questions are completely different.