利用推车机将矿车推入罐笼后，把钩工一定要将头探入罐笼内观察矿车停放情况。
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Why would you use the following FLASHBACK TABLE command？（） FLASHBACK TABLE emp TO TIMESTAMP （’11：45’，’hh12：mi’）;
A. to undo the changes made to the EMP table since the specified time
B. to restore the EMP table that was wrongly dropped from the database
C. to view the transactions that have modified the EMP table since the specified time
D. to view the changes made to the EMP table for one or more rows since the specified time
E. to recover the EMP table to a point in time in the past by restoring the most recent backu
（）是社会主义道德建设的基本任务。
A. 以德治国
B. 弘扬中华传统美德
C. 全面提高公民道德素质
交接双方必须按规定时间在工作现场进行交接。罐笼等提升容器在运行中，一律不准进行交接班，须待罐笼到位停稳，并打定点信号后才准交接。
A. 正确
B. 错误
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