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一、单项选择题（在每小题的四个备选答案中选出一个正确的答案，并将其号码填在题干后的括号内。每小题１分，共１５分）１在一个用于表示两个实体间联系的关系中，用来表示实体间联系的是该关系中的（） Ａ．任何一个属性 Ｂ．任何多个属性集 Ｃ关键字Ｄ．外部关键字２．模式
A single choice (in each of the four candidate answers to choose a correct answer, and fill in the number after the title in brackets.) 1 point for each small question, a total of 15) 1 in a Used to represent the relationship between two entities in the relationship between the entities used to represent the relationship between the () A in the relationship. Any one attribute Any multiple attribute set C keyword D. External keywords 2. mode