梯度功能表面技术
简述对象、类和实例之间的关系。
城市公交系统整合最终目标？
催化剂预硫化结束后催化剂初活稳定选用直馏油的原因是什么？
You are operating your database in NOARCHIVELOG mode. Your most recent backup includes a copy of all of the data files and the control files taken when the current log sequence number was 45. You experience disk failure on the drive on which your SYSTEM tablespace data files are stored. At the time of the failure， the current log sequence number is 98. Which files should you restore to recover from the loss of the SYSTEM tablespace data files？（） ["Only the data files.","All of the data files and the control files.","Only the data files belonging to the SYSTEM tablespace.","Only the data files belonging to the SYSTEM tablespace and the control files."]
象征性游戏
