皮皮学，免费搜题
登录
搜题
【简答题】
已知如图，△ABC和△DCE都是等边三角形，若△ABC的边长为1，则△BAE的面积是 ，四ABCD和四BEFG都是正方形，若正方形ABCD的边长为4，则△FAC的面积是8，……，如果两个正多ABCDE…和BPKGY…是正n(n≥3)，正多ABCDE …的边长是2a，则△KCA的面积是 .（结果用含有a、n的代数式表示）
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
.
..
皮皮学刷刷变学霸
举一反三
【单选题】Note the output of the following query；   SQL> SELECT flashback_archieve_name， status FROM dba_flashback_archieve； FLASHBACK_ARCHIEVE_NAME STATUS FLA1   You executed the following command to enable Fl...
A.
The table uses the default Flashback Data Archive.
B.
The Flashback Data Archive Is created In the SYSAUX tablespace.
C.
The Flashback Data Archive is created in the same tablespace where the tables are stored.
D.
The command generates an error because no flashback Data Archive name is specified and there is no default Flashback Data Achieve.
查看完整题目与答案
【多选题】These are the details about V$FLASHBACK_DATABASE_STAT：  SQL> DESC V$FLASHBACK_DATABASE_STAT Name Null？ Type  ------------- -------- --------------  BEGIN_TIME DATE END_TIME DATE  FLASHBACK_DATA NUMBER...
A.
BEGIN_TIME is the time at which Flashback logging is enabled.
B.
END_TIME is the time at which the query is executed on the view.
C.
REDO_DATA is the number of bytes of redo data written during the interval.
D.
This view contains information about flashback data pertaining to the last 24 hours.
E.
FLASHBACK_DATA is the amount of flashback data generated since the database was opened.
查看完整题目与答案
【单选题】A corporation is a busine s s o r ganization that is f o rmed to act as a single person and is l e g a lly ______ with particular rights and duties.
A.
c reated
B.
demanded
C.
endowed
D.
traced
查看完整题目与答案
【单选题】You executed the following query in your database： SELECT oldest_flashback_scn， oldest_flashback_time FROM V$FLASHBACK_DATABASE_LOG； What would you determine from the output？（）
A.
The time when the last flashback operation in your database was performed.
B.
The time when the first flashback operation in your database was performed.
C.
A list of flashback operations performed in your database using SCN and time.
D.
The approximate time and the lowest system change number （SCN） to which you can flash back your database.
查看完整题目与答案
【多选题】Which three statements are true about Flashback Database?（）
A.
Flashback logs are written sequentially, and are archived.
B.
Flashback Database uses a restored control file to recover a database.
C.
The Oracle database automatically creates, deletes, and resides flashback logs in the Fast RecoveryArea.
D.
Flashback Database can recover a database to the state that it was in before a reset logs operation.
E.
Flashback Database can recover a data file that was dropped during the span of time of the flashback.
F.
Flashback logs are used to restore to the blocks' before images, and then the redo data may be used to roll forward to the desired flashback time.
查看完整题目与答案
【单选题】我国丹霞地貌中最高的山地是( )。
A.
福建的冠名山
B.
福建武夷山
C.
安徽齐云山
D.
江西龙虎山
查看完整题目与答案
【单选题】You disabled the Flashback Database feature by using the following command：  SQL> ALTER DATABASE FLASHBACK OFF；  What would be the effect of this command on the existing flashback logs？（）
A.
Flashback logs are not deleted.
B.
Flashback logs are deleted automatically.
C.
Flashback logs are deleted only if you are using Recovery Manager （RMAN）
D.
Flashback logs are deleted only if you are using Oracle Manager Files （OFM）
E.
Flashback logs are deleted only if you are using Automatic Storage Management （ASM）
查看完整题目与答案
【单选题】有“一石插天，直入云汉，谓之齐云”之美称的安徽齐云山是我国（）地貌中最高的山地。
A.
岩溶
B.
丹霞
C.
花岗岩
D.
其它
查看完整题目与答案
【单选题】我国丹霞地貌中最高的山地是( )
A.
安徽丹霞山
B.
广东丹霞山
C.
安徽齐云山
D.
广东齐云山
查看完整题目与答案
【简答题】拉伸的好处有哪些?
查看完整题目与答案
相关题目：
【单选题】Note the output of the following query；   SQL> SELECT flashback_archieve_name， status FROM dba_flashback_archieve； FLASHBACK_ARCHIEVE_NAME STATUS FLA1   You executed the following command to enable Fl...
A.
The table uses the default Flashback Data Archive.
B.
The Flashback Data Archive Is created In the SYSAUX tablespace.
C.
The Flashback Data Archive is created in the same tablespace where the tables are stored.
D.
The command generates an error because no flashback Data Archive name is specified and there is no default Flashback Data Achieve.
查看完整题目与答案
【多选题】These are the details about V$FLASHBACK_DATABASE_STAT：  SQL> DESC V$FLASHBACK_DATABASE_STAT Name Null？ Type  ------------- -------- --------------  BEGIN_TIME DATE END_TIME DATE  FLASHBACK_DATA NUMBER...
A.
BEGIN_TIME is the time at which Flashback logging is enabled.
B.
END_TIME is the time at which the query is executed on the view.
C.
REDO_DATA is the number of bytes of redo data written during the interval.
D.
This view contains information about flashback data pertaining to the last 24 hours.
E.
FLASHBACK_DATA is the amount of flashback data generated since the database was opened.
查看完整题目与答案
【单选题】A corporation is a busine s s o r ganization that is f o rmed to act as a single person and is l e g a lly ______ with particular rights and duties.
A.
c reated
B.
demanded
C.
endowed
D.
traced
查看完整题目与答案
【单选题】You executed the following query in your database： SELECT oldest_flashback_scn， oldest_flashback_time FROM V$FLASHBACK_DATABASE_LOG； What would you determine from the output？（）
A.
The time when the last flashback operation in your database was performed.
B.
The time when the first flashback operation in your database was performed.
C.
A list of flashback operations performed in your database using SCN and time.
D.
The approximate time and the lowest system change number （SCN） to which you can flash back your database.
查看完整题目与答案
【多选题】Which three statements are true about Flashback Database?（）
A.
Flashback logs are written sequentially, and are archived.
B.
Flashback Database uses a restored control file to recover a database.
C.
The Oracle database automatically creates, deletes, and resides flashback logs in the Fast RecoveryArea.
D.
Flashback Database can recover a database to the state that it was in before a reset logs operation.
E.
Flashback Database can recover a data file that was dropped during the span of time of the flashback.
F.
Flashback logs are used to restore to the blocks' before images, and then the redo data may be used to roll forward to the desired flashback time.
查看完整题目与答案
【单选题】我国丹霞地貌中最高的山地是( )。
A.
福建的冠名山
B.
福建武夷山
C.
安徽齐云山
D.
江西龙虎山
查看完整题目与答案
【单选题】You disabled the Flashback Database feature by using the following command：  SQL> ALTER DATABASE FLASHBACK OFF；  What would be the effect of this command on the existing flashback logs？（）
A.
Flashback logs are not deleted.
B.
Flashback logs are deleted automatically.
C.
Flashback logs are deleted only if you are using Recovery Manager （RMAN）
D.
Flashback logs are deleted only if you are using Oracle Manager Files （OFM）
E.
Flashback logs are deleted only if you are using Automatic Storage Management （ASM）
查看完整题目与答案
【单选题】有“一石插天，直入云汉，谓之齐云”之美称的安徽齐云山是我国（）地貌中最高的山地。
A.
岩溶
B.
丹霞
C.
花岗岩
D.
其它
查看完整题目与答案
【单选题】我国丹霞地貌中最高的山地是( )
A.
安徽丹霞山
B.
广东丹霞山
C.
安徽齐云山
D.
广东齐云山
查看完整题目与答案
【简答题】拉伸的好处有哪些?
查看完整题目与答案