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【简答题】
按 IEEE 规定,( 0/0 ),(0×∞ ),(∞╱∞ )和( ∞—∞)等运算产生 _ _ 。
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反馈参考答案：
举一反三
【简答题】与地图要素位量有关的错误,我们称为( ),如缺失线条或缺失多边形。
【简答题】中国古代绘画按题材分为
【单选题】Which of the following statements best describes Flashback Versions Query？（）
A.
Flashback Versions Query is used to make changes to multiple versions of data that existed between two points in time.
B.
Flashback Versions Query is used to view all version changes on rows that existed between the time the query was executed and a point in time in the past.
C.
Flashback Versions Query is used to view version changes and the SQL to undo those changes on rows that existed between two points in time.
D.
Flashback Versions Query is used to view all version changes on rows that existed between two points in time.
【单选题】Which of the following statements is true regarding the VERSIONS BETWEEN clause？（）
A.
The VERSIONS BETWEEN clause may be used in DML statements.
B.
The VERSIONS BETWEEN clause may be used in DDL statements.
C.
The VERSIONS BETWEEN clause may not be used to query past DDL changes to tables.
D.
The VERSIONS BETWEEN clause may not be used to query past DML statements to tables.
【简答题】A．groups B．sets C．species D．versions
【单选题】“这个软件有两种版本”地道的英文翻译是( )
A.
This software has two versions.
B.
Two versions of the software are available.
C.
This softwares have two versions.
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