PowerPoint是一个（）软件。
户一般用（）工具来建立分区上的文件系统。
A、mknod
B、fdisk
C、foemat
D、mkfs
构件RULESURF曲面时，产生扭曲或变形的原因是（）。
A、指定曲面边界时点的位置反了
B、指定曲面边界时顺序反了
C、连接曲面边界的点的几何信息相同而拓扑信息不同
D、曲面边界不封闭
E、曲面边界一个封闭而另一个不封闭
You want to take a complete database backup using RMAN. The backup should consist only the used blocks from your database. Which two statements are true about this backup operation? （）(Choose two.)
ABackup compression should be enabled
BParallelism for the channel should be set to 2
CAll the files must be backed up as backup sets
DThe backup may be stored either on disk or on media with media manager
If you are going to run a TSPITR recovery， which view will help you to determine which objects will be lost during the TSPITR？（）
A、 TS_OBJECTS_TO_BE_DROPPED
B、 TS_PTTR_OBJECT_DROPPED
C、 TS_PITR_OBJECTS_TO_BE_DROPPED
D、 TS_OBJECTS_DROPPED
E、 TS_DROPPED_OBJECTS
在OSI参考模型中，会话层的上层是，下层是（）。
A、表示层，应用层
B、表示层，传输层