A UDT is a data type which:()
A、must contain unique values.
B、cannot be CAST to other data types.
C、is created using the CREATE DISTINCT command.
D、contains a value that was automatically calculated from values in other columns.
若两台主机在同一子网中,则两台主机的IP地址分别与它们的子网掩码相“与”的结果一定()。
A、为全0
B、为全1
C、相同
D、不同
Which three statements correctly describe the features of the I/O calibration process?()
AOnly one I/O calibration process can run at a time.
BIt automates the resource allocation for the Automated Maintenance Tasks.
CIt improves the performance of the performance-critical sessions while running.
DIt can be used to estimate the maximum number of I/Os and maximum latency time for the system.
EThe latency time is computed only when the TIMED_STATISTICS initialization parameter is set to TRUE.
CTAIS服务器端的主要功能是存储业务数据、提供部分业务处理逻辑,确保数据利用的安全、正确、完整、高效。
A、对
B、错
患者,男性,52岁。行硬膜外腔阻滞腹腔镜胆囊切除术,术后患者出现剧烈背痛,进行性脊髓压迫症状,伴肌无力、尿潴留、括约肌功能障碍,继而出现完全性截瘫。首先考虑患者发生了()
A、硬膜外血肿
B、麻醉药中毒反应
C、全脊髓麻醉
D、假性脑膜炎
E、麻醉平面过高
如果文件系统中有两个文件重名,不应采用()。
A、单级目录结构
B、树型目录结构
C、二级目录结构
D、A和C