Identify two situations in which you can use Data Recovery Advisor for recovery.()
A. The user has dropped an important table that needs to be recovered.
B. The database files are corrupted when the database is open.
C. You are not able to start up the database instance because the required database files are missing.
D. The archived log files are missing for which backup is not available.
查看答案
高频声刺激时,劲度对声音传递的影响大;250Hz以下频率声波的阻抗主要受质量影响。
A. 正确
B. 错误
应蒋介石邀请,1945年8月毛泽东到重庆与国民党谈判。毛泽东去重庆谈判的目的是()
A. 中共假和谈,真内战
B. 同国民党商讨抗日合作策略
C. 揭穿蒋介石假和平的阴谋
D. 加强与美国的合作
下列哪些种类的船舶应签发货船适航证书:()
A. 工程船
B. 车客渡
C. 起重船
D. 高速公务艇
扩谱通信的理论基础是高斯定理。
A. 正确
B. 错误