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【单选题】
You executed the following query in your database： FROM V$FLASHBACK_DATABASE_LOG; What would you determine from the output？（）A.
the time when the last flashback operation in your database was performed
B.
the time when the first flashback operation in your database was performed
C.
a list of flashback operations performed in your database using SCN and time
D.
the approximate time and the lowest system change number （SCN） to which you can flash back your database
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反馈参考答案：
举一反三
【简答题】作业7.doc
【简答题】同步发电机可能发生哪些故障以及异常运行状况?发电机保护有哪些方案?
【简答题】下图所示电路原已稳定，开关S在t=0时由a打至b。求i C (t)，i L (t)，u L (t)。
【单选题】易炭化物是指( )
A.
药物中存在的有色杂质
B.
药物中所夹杂的遇硫酸易炭化或氧化而呈色的有机杂质
C.
影响药物澄明度的无机杂质
D.
有机氧化物
E.
有色络合物
【单选题】What esle should you state at the first paragrah in an enqiury letter besides self-introduction?
A.
your thanks
B.
your purpose of writing this letter
C.
your questions
D.
your answer
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