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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.
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Direction: Fill in the blanks with the phrases given below. Change the form if necessary.[have access to; go off; desperate for; put up with; always the case; give advice; concentrate on; arrive at; make an effort; come in handy]8. The prisoner[填空1]to escape, but he couldnt climb up the prison wall.
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为什么说新民主主义社会是一个过渡性社会?
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对农业的社会主义改造,,经历了[填空]、初级社和高级社三个阶段。
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1894年,孙中山在[填空]创立兴中会。
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1856年9月,太平天国内部自相残杀的事件是[填空]。
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中国旧式农民战争的最高峰是[填空]起义 。