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在现实世界中,事物内部及事物之间是普遍联系的,这些联系在信息世界中表现为实体型内部各属性之间的联系以及实体型之间的联系。两个实体型之间的联系可以分为三类,分别是:_____ _1_ _______;_____ _2_ _______;_____ 3_ ________;
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