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Last week I ____ ____ ____ _____(1). I _____(2) a very good seat. The play was ________(3). I ______ ______ (4)enjoy it. A young man and a young woman ______ _______(5) behind me. They were talking ________(6). I got very angry. I ____ ______ ______(7)hear the actors. I turned around. I looked at the man and the woman _______(8). They did not ____ _____ ____(9). In the end, I could not ____(10) it. I turned round again. "I can't hear a word!" I said angrily. "___ ____ __ ____ ______"(11) the young man said rudely. "This is a _____ _______(12)" .
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【简答题】在 SQL 中,关系模式称为 ,子模式称为 。
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