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概念模型中两实体型之间的联系主要有 1:1、[填空1]、m:n三种。
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关系模型的三类完整性约束是实体完整性、参照完整性和[填空1]。
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Direction: Fill in the blanks with the words given below. Change the form if necessary.[chore; talent; crowded; earnings; finance; festive; memorable; sacrifice; smash; reproduction]6. A crowd of youths started[填空1]windows.
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Directions: Fill in the blanks with the words given below. Change the form if necessary.(pros and cons; allocation; update; complexity; infancy; initially; minimal;strategically; grab; digest)9. The report concluded that the impact would be[填空1]because of the rivers continuous flow.