【单选题】Which of the following is the default location for temp files in Windows 7?()
B.
C:///Windows/SystemFiles/TempFiles
【单选题】A user executes a query on the EMP table, which contains thousands of rows, to get details about employees in one of the departments. The user receives the following error: SQL> SELECT ename FROM emp ...
A.
The tempfile belonging to the default temporary tablespace is missing.
B.
The database is opened in restricted mode, so queries are not allowed.
C.
The default temporary tablespace required to execute the query is offline.
D.
The default temporary tablespace required to execute the query is dropped.
E.
The default temporary tablespace required to execute the query is readonly.
【判断题】若向量组I能由向量组II线性表示,则r(I)≤r(II)。
【简答题】群落中生物种类的多少直接影响着群落的 _____ ,同时还防止_____ 。
【单选题】成文日期的标识做到( )
C.
其中的数字应用汉字标识,如二零一九年三月十五日
【判断题】设 为 维向量,若 不能由 线性表示,则 线性无关。
【判断题】若向量组A能够由向量组B线性表示,则向量组A的秩不大于向量组B的秩。
【判断题】若向量组 A 能由向量组 B 线性表示,则 R ( B )≤ R ( A )。