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第1题

一个关系模式的定义主要包括（）（）（）（）（）
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第2题

When he wrote to his father that he wanted to ____ his education and get married, his father cut off his allowance.　 (
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第3题

一个关系模式的定义格式为（）
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第4题

His speech was warmly received. It was several minutes before the applause _______.　 (A) died down (B) died of (C)
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