You are working as a DBA at NetFx Corporation. You discover that the SCOTT schema is deleted by mistake. You decide to flash the database back to the time when the schema existed. Which view will you query to determine the estimated size of the flashback data that you require for your current target retention？（） [" V$FLASHBACK_DATABASE_LOG"," V$FLASHBACK_DATABASE_STAT"," V$DATABASE"," V$UNDOSTAT"]
What is the result？（） ["Compilation fails.","An exception is thrown at runtime.","The code executes and prints "running".","The code executes and prints "runningrunning".","The code executes and prints "runningrunningrunning"."]
《水利工程施工监理规范》规定：混凝土试样平行检测的检测数量不应少于承包人检测数量的3%，重要部位每种标号的混凝土最少取样1组。
零件在径向位置上有偏重，其偏重总是停留在（）方向的最低位置。
差别计件工资制是（）的内容之一。 ["泰罗的科学管理理论\\","法约尔的一般管理理论","韦伯的行政管理理论","现代管理理论"]
公共绿地
