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【单选题】
接触式机械密封的密封面间隙h=( ),摩擦状态一般为混合摩擦和边界摩擦。A.
0.5～1μm
B.
0.6～1.2μm
C.
0.5～1.2μm
D.
0.2～0.8μm
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【单选题】You executed the following command: RMAN> RECOVER COPY OF DATAFILE '/u01/app/oracle/oradata/orcl/users01.dbf'; Which statement regarding the above command is correct?（）
A.
The '/u01/app/oracle/oradata/orcl/users01.dbf' data file is recovered from the image copy
B.
The '/u01/app/oracle/oradata/orcl/users01.dbf' data file is recovered from the last incremental backup
C.
Image copies of the '/u01/app/oracle/oradata/orcl/users01.dbf' data file are updated with all changes up to incremental backup SCN. '/ u01/app/oracle/oradata/orcl/users01.dbf
D.
Image copies of the '/u01/app/oracle/oradata/orcl/users01.dbf' data file are recovered using the above command if data file recovery fails
【单选题】Examine the following values of the initialization parameters in the database having the SID ORCL： BACKGROUND_DUMP_DEST=/u01/app/oracle/product/11.1.0/db_1/bdump USER_DUMP_DEST=/u01/app/oracle/produ...
A.
/u01/app/oracle/product/11.1.0/db_1
B.
/u01/app/oracle
C.
$ORACLE_HOME/bdump
D.
$ORACLE_HOME/log
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