Consider the following scenario for your database: - Backup optimization is enabled in RMAN. - The recovery window is set to 7 days in RMAN. - The most recent backup to disk for the TOOLS tablespace was taken on November 3, 2007. - The TOOLS tablespace is read-only since November 4, 2007. On November 23, 2007, you issue the RMAN command to back up the database to disk. Which statement is true regarding the backup of the TOOLS tablespace?（） The RMAN backup fails because the TOOLS tablespace is read-only。 The RMAN skips the backup of the tablespace because backup optimization is enabled。 The RMAN makes backup because optimization can be enabled only for backups to disk。 The RMAN makes the backup because no backup of the tablespace exists within the seven day window。
The Oracle Database 11g database is running in the ARCHIVELOG mode. The archived redo log files are stored on three locations. The Flash Recovery Area is one of the locations. The details are given below： LOG_ARCHIVE_DEST_1 = ’LOCATION = /disk1/archive’ LOG_ARCHIVE_DEST_2 = ’SERVICE = stdb1’ DB_RECOVERY_FILE_DEST = ’/u01/oradata’ Examine the following RMAN command issued to set the deletion policy for archived log files： RMAN> CONFIGURE ARCHIVELOG DELETION POLICY TO BACKED UP 2 TIMES TO sbt； Which statement is true regarding what this command accomplishes？（） All archived redo log files backed up at least twice to tape are deleted.。 All archived redo log files backed up at least once to tape are eligible for deletion.。 All archived redo log files backed up at least twice to tape are deleted from the flash recovery area.。 All archived redo log files in local archiving destinations and the flash recovery area backed up at least twice to tape are eligible for deletion.。
我国农业税制改革的实施步骤是？
某新建工程，建筑面积82000m2，地下3层，地上20层，钢筋混凝土框架一剪力墙结构，距邻近6层住宅楼7m。地基土层为粉质黏土和粉细砂，地下水为潜水，地下水位一9.5m，自然地面一0.5m。基础为筏板基础，埋深14.5m，基础底板混凝土厚1500mm，水泥采用普通硅酸盐水泥，采取整体连续分层浇筑方式施工。基坑支护工程委托有资质的专业单位施工，降排的地下水用于现场机具、设备清洗。主体结构选择有相应资质的A劳务公司作为劳务分包，并签订了劳务分包合同。 合同履行过程中，发生了下列事件：
事件1：基坑支护工程专业施工单位提出了基坑支护降水采用“排桩+锚杆+降水井”方案，施工总承包单位要求基坑支护降水方案进行比选后确定。
事件2：底板混凝土施工中，混凝土浇筑从高处开始，沿短边方向自一端向另一端进行，在混凝土浇筑完12h内对混凝土表面进行保温保湿养护，养护持续7日。养护至72h时，测温显示混凝土内部温度70℃，混凝土表面温度35℃。
事件3：结构施工到十层时，工期严重滞后。为保证工期，A劳务公司将部分工程分包给了另一家有相应资质的B劳务公司，B劳务公司进场工人100人。因场地狭小，B劳务公司将工人安排在本工程地下室居住。工人上岗前，项目部安全员向施工作业班组进行了安全技术交底，双方签字确认。
指出事件2中底板大体积混凝土浇筑及养护的不妥之处，并说明正确做法。
地区性产业布局的依据是（） A.自然环境上有一定的类似性和关联性 。 B.经济发展与布局现状有一定的相似性和互补性 。 C.一定的产业政策的指导 。 D.拥有实力雄厚的经济中心。
公开密钥加密也称（）
