Which two are the prerequisites to enable Flashback Data Archive?（） (Choose two.) [" Database must be running in archivelog mode."," Automatic undo management must be enabled."," Undo retention guarantee must be enabled."," The tablespace on which the Flashback Data Archive is created must be managed with Automatic Segment Space Management (ASSM)."]
乔灌木的管理：
Click the Exhibit button. What is the output if the main() method is run?（） ["4","5","8","9","Compilation fails.","An exception is thrown at runtime.","It is impossible to determine for certain."]
义务教育
开标人员应当在开标前检查出席开标会议的投标人法定代表人的证明文件或者授权代表人有关身份证明。
简述幼儿园管理过程各个环节及其特点。
