[单选] 一般苦咸水RO脱盐系统回收率多采用（）

You are managing the APPPROD database as a DBA which is not using the Oracle-managed files. You plan to duplicate this database in the same system with the name DUPDB.You want to create the same directory structure for duplicate database files as of the target database. You executed the following RMAN commands: What are the implications of this command?（） It creates database files for the duplicate database under the Oracle base with a different directory for the duplicate database.。 It overwrites data files of the target database because a different location for data files is not mentioned for the duplicate database.。 It creates database files for the duplicate database under the same Oracle home as that of the target database with the same directory structure.。 It creates database files for the duplicate database under the same Oracle home as that of the target but with a different directory for the duplicate database.。 试述影响食品安全性评价的因素。 草地退化与草地沙漠化 以下关于食品的低温储存技术的论述，正确的是（） 冷却法适用于水分含量较高的生鲜食品。 -2℃～2℃是果蔬的储藏温度。 使用冷冻法储藏食品时，其温度控制在0℃～10℃。 低温储存技术是利用低温降低氧气浓度抑制霉腐微生物的生理活动。 Your database operates in ARCHIVELOG mode. User­managed consistent backups are performed every Sunday night.  On Tuesday， client A drops a table at 8：00 a.m. as follows：  SQL> DROP TABLE cust_ord PURGE;  Table dropped.  Client B executes a query at 9：00 a.m. on the same table as follows：  SQL> SELECT * FROM cust_ord; SELECT * FROM cust_ord *  ERROR at line 1：  ORA­00942： table or view does not exist  Client B needs the dropped table and reports the problem to you. With reference to this scenario， which action should you take？（） retrieve the table by using the flashback feature。 restore all the data files from last Sunday’s backup， and then perform a time­based recovery。 restore all the data files from last Sunday’s backup， and then perform a log sequence recovery。 restore all the data files from last Sunday’s backup， and then perform a cancel­based recovery。 restore from last Sunday’s backup only data files that belong to the tablespace in which the table was stored， and then perform a complete recovery。 一般苦咸水RO脱盐系统回收率多采用（）