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【单选题】
关于分布式数据库,下列说法错误的是
A.
水平分片是从行的角度依据一定的条件将关系划分为不同的片段,关系中的每一行至少属于一个片段
B.
垂直分片是从列的角度依据一定的条件将关系划分为不同的片段,关系中的主码只属于某一个片段
C.
分布式数据库由于数据物理上分布在多个不同的场地上,因此在进行查询处理设计时需要充分考虑站点闻传输数据的通信代价
D.
分片透明性是最高级别的透明性,位于全局概念模式与分片模式之间
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He will become a teacher.
B.
He will become a lawyer.
C.
He will try a lot of jobs.
D.
He has not decided yet.
【单选题】听力原文:M: What are you doing after graduation? W: I'm not sure. I may be a teacher. But I want to do more than just teaching, maybe practice law. How about you? M: I don't have any plans yet. Things all...
A.
He will become a teacher.
B.
He will become a lawyer.
C.
He will try a lot of jobs.
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He has not decided yet.
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A.
生活方式
B.
语言
C.
风俗习惯
D.
结婚或离婚
【单选题】听力原文:M: What are you doing after graduation? W: I'm not certain. I may become a teacher. But I want to do more than just teaching, maybe practicing law. What about you? M: I don't have any plans yet. ...
A.
He will become a teacher.
B.
He has not decided yet.
C.
He will try a lot of jobs.
D.
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