国务院、中国保监会、国务院有关部委发出的通知、指示、命令或制定的办法称为()。
A. 规章
B. 规范性文件
C. 法律
D. 行政法规
新生儿缺氧缺血性脑病,早产儿的易损区在__________,足月儿则位于______________________。
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.
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