The file “file.txt” exists on the file system and contsins ASCII text.  Given：   try {   File f = new File（“file.txt”）；    OutputStream out = new FileOutputStream（f， true）；   }    catch （IOException） {}   What is the result？（）

A . LIST B . CHANGE C . CATALOG D . CROSSCHECK

A . the CONVERT command of RMAN B . Data Pump Export and Import into the same database C . conventional export and import into the same database D . the BACKUP DATABASE and RESTORE DATABASE commands of RMAN E . the BACKUP AS COPY DATABASE and SWITCH DATABASE TO COPY command of RMAN

A . LIST EXPIRED B . DELETE EXPIRED C . DELETE OBSOLETE D . CHANGE UNCATALOG

A .  String name= File.getParentName（“file.txt”）； B .  String name= （new File（“file.txt”））.getParent（）； C .  String name = （new File（“file.txt”））.getParentName（）； D .  String name= （new File（“file.txt”））.getParentFile（）； E .  Directory dir=（new File （“file.txt”））.getParentDir（）；  String name= dir.getName（）；

A .  Configure Windows Azure Diagnostics to transfer event logs. B .  Configure Windows Azure Diagnostics to transfer directories. C .  Configure Windows AzureDiagnostics to transfer performance counters. D .  Configure Windows Azure Diagnostics to transfer basic Windows Azure logs.

A . Deploy Network Policy Server （NPS） and create a network policy. B . Deploy Print and Document Services and create a custom printer filter. C . Deploy File Server Resource Manager （FSRM） and create a file classification rule. D . Deploy Active Directory Rights Management Services （AD RMS） and create an AD RMS rights policy  template.

A .  dump -t core  B .  strings core  C .  trace -a core  D .  crash core /unix_u

A . rwxr--rw- B . rw-r--r— C . --xr--rwx D . rwxr--r—

A . copyfile1.txtfile2.txt B . cpfile1.txt|file2.txt C . catfile2.txtfile1.txt D . catfile1.txt>file2.txt

A . Boot into Directory Services Restore Mode and use wbadmin to restore critical volume. B . Boot into Directory Services Restore Mode and use the backup snap-in to restore critical volume C . Boot into Safe Mode and use wbadmin to restore critical volume D . Boot into Safe Mode and use the backup snap-in to restore critical volume

A . N7900  B . N6040  C . DS3300  D . DS3500

A . FileOutputStream out=new FileOutputStream（“file.txt”，true）； B . OutputStream out=new FileOutputStream（“file.txt”，“append”）； C . OutputStream out=new FileOutputStream（“file.txt”）； D . FileOutputStream out=new FileOutputStream（new file（“file.txt”））； E . OutputStream out=new FileOutputStream（new File（“file.txt”），true.；

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 . 精确检索 B . 模糊查询 C . 条件检索 D . 条件查询

A .  Data Pump Export and Import B .  conventional export and import C .  the CONVERT command of RMAN D .  the BACKUP AS COPY. command of RMAN

A . Password file  B . Initialization file  C . Datafile  D . Control file  E . Nothing - SYSDBA privileges are not required for these actio

A .  OutputStream out=new FileOutputStream（“file.txt”）； B .  OutputStream out=new FileOutputStream（“file.txt”， “append”）； C .  FileOutputStream out=new FileOutputStream（“file.txt”， true）； D .  FileOutputStream out=new FileOutputStream（new file（“file.txt”））； E .  OutputStream out=new FileOutputStream（new File（“file.txt”）true）；

A .  InputStream in=new FileReader（“file.txt”）； B .  InputStream in=new FileInputStream（“file.txt”）； C .  InputStream in=new InputStreamFileReader （“file.txt”， “read”）； D .  FileInputStream in=new FileReader（new File（“file.txt”））； E .  FileInputStream in=new FileInputStream（new File（“file.txt”））；

A．copy filetxt file2.txt B．cp filetxt | file2.txt C．cat file2.txt filetxt D．cat filetxt ＞ file2.txt

A．hdfs dfs -put file.txt /path B．hdfs dfs -put /path file.txt C．hadoop dfs -put /path file.txt D．hdfs fs -put file.txt /path

A:正确; B:错误

A．wc>fil E．txt B．wc>>fil E．txt C．wc D．wc<