In which scenario will you use the Flashback Transaction Query feature？（） when you want to restore an important table that is dropped from the Recycle Bin。 when you want to obtain the SQL statements to undo the deletion of some important records from a table by a transaction。 when you want to restore a dropped user’s schema。 when a row of a table is updated many times within a specific time period and you want all the versions of the row in the specified time period。
新建锅炉投入运行的必备条件包括（）、（）、（）。
某男，不慎触电后倒地。脱离电源后，轻摇并呼唤患者，不见其反应。判断该患者心脏骤停的快捷方法是（） 听心音。 触颈动脉搏动。 观察瞳孔反映。 观察胸廓起伏。 测量血压。
砂浆强度应以标准养护、龄期为（）的试块抗压强度实验结果为准。 21d。 24d。 28d。 30d。
You want to schedule a job to rebuild all indexes on the SALES table after the completion of a bulk load operation. The bulk load operation must also be a scheduled job that executes as soon as the first file that contains data arrives on the system. How would you create these jobs？（） Create both jobs by using events raised by the scheduler。 Create both jobs by using events raised by the application。 Create a job to rebuild indexes by using events arised by the application and then create another job to perform bulk load by using events raised by the scheduler。 Create a job to rebuild indexes by using events arised by the Scheduller and then create another job to perform bulk load by using events raised by the applicatio。
在1859～1905年间，印度社会出现的对未来发展影响最大的变化是（）。
