The 15-year-old Jenny preferred early morning shopping to midnight shopping.（）

A . So is B . So does C . Nor is D . Nor doe

A . 正确 B . 错误

A . 0，32768 B . 100，0 C . 255，100 D . 32768，0

A . 0 B . >0 C . 不确定 D . 都可以

A . MED是可选过渡属性，LOCAL-PREF是公认非过渡属性 B . MED通常通过外部链路宣告给对等体，区分本地AS到同一邻居AS之间的多入口链路 C . LOCAL_PREF必须包含在UPDATE消息中，并传递到其它BGP邻居 D . LOCAL_PREF只能发布给IBGP邻居，数值越高越优先

A . Automatic statistics collection is stopped for the CUSTOMERS table. B . Statistics for the CUSTOMERS table are locked and cannot be overwritten. C . Existing statistics for the CUSTOMERS table become unusable for the query optimizer. D . Subsequently， statistics gathered on the CUSTOMERS table are stored as pending statistics.

A .  Boolean exists=Directory.exists （“prefs”）； B .  Boolean exists=（new File（“prefs”））.isDir（）； C .  Boolean exists=（new Directory（“prefs”））.exists（）； D .  Boolean exists=（new File（“prefs”））.isDirectory（）； E .  Boolean exists=true；  Try{  Directory d = new Directory（“prefs”）；  } catch （FileNotFoundException e） {  exists = false；  }

A . convicted B . sentenced C . arrested D . attacked

A . crontab -l jenny B . crontab -e jenny C . crontab -l -u jenny D . crontab -e -u jenny

A . 正确 B . 错误

A . LOCAL_PREF拥有更高的优先级 B . PREFERRED-VALUE可针对邻居进行设置 C . LOCAL_PREF是影响入流量的路径选择 D . BGP路径选择的原则最先比较LOCAL_PREF，再比较PREFERRED-VALUE

A . Statistics collection is not done for the CUSTOMERS table when schema stats are gathered. B . Statistics collection is not done for the CUSTOMERS table when database stats are gathered. C . Any existing statistics for the CUSTOMERS table are still available to the optimizer at parse time. D . Statistics gathered on the CUSTOMERS table when schema stats are gathered are stored as pending statistics. E . Statistics gathered on the CUSTOMERS table when database stats are gathered are stored as pending statistics.

A . Automatic statistics collection is stopped for the CUSTOMERS table. B . Statistics for the CUSTOMERS table are locked and cannot be overwritten. C . Existing statistics for the CUSTOMERS table become unusable for the query optimizer. D . Subsequently， statistics gathered on the CUSTOMERS table are stored as pending statistic

A．Right B．Wrong C．Not mentioned

A.of B.why C.that D.when

A.did B.has been doing C.has done

A.AutomaticstatisticscollectionisstoppedfortheCUSTOMERStable. B.StatisticsfortheCUSTOMERStablearelockedandcannotbeoverwritten. C.ExistingstatisticsfortheCUSTOMERStablebecomeunusableforthequeryoptimizer. D.Subsequently，statisticsgatheredontheCUSTOMERStablearestoredaspendingstatistics

A．Because she loved some of the men who wrote to her． B．Because she thought they were a part of her life C．Because her daughter often played with them．