You are working on an Oracle Database 10g database. Because of data loss， you decided to perform a Flashback Database operation using the following command： SQL> FLASHBACK DATABASE TO TIMESTAMP（SYSDATE ？5/24）； Which two statements are true？ （） [" SYSDATE should not be used with TIMESTAMP."," The database must have multiplexed redo log files."," The database must be in the MOUNT state to execute the command."," The database must be opened with the RESETLOGS option after the flashback operation."," The entire database needs to be restored from the most recent backup before the flashback operation."]
《国家防汛抗旱应急预案》确定建立预防预警信息制度，其中包括以下哪几个选项（） ["工程信息","洪涝灾情信息","天气预报","江河洪水预警"]
If class Donkey2 is invoked twice， the first time without assertions enabled， and the second time with assertions enabled， what are the results？（） ["no output","no output assert is on","assert is on","no output ， An Assertion Error is thrown.","assert is on ， An AssertionError is thrown."]
热油炉在启动时高温热油温度计指针（）设计值（温度调节器指针） ["高于","等于","低于"]
在中国封建历史上，几乎所有的改革，都会受到保守派的极力阻挠，作为其依据的，就是所谓（）前所未有，与所传之（）相悖不能相容。
论述往复活塞式压缩机卡住或咬住或撞裂的原因。
