题目内容

You have many users complaining about slow inserts into a large table. While investigating the reason, you find that the number of indexes on the table is high. You want to find out which indexes are not being used. Which method would you follow to achieve this?()

A. enable index monitoring and query the DBA_OBJECTS view
B. enable index monitoring and query the DBA_INDEXES view
C. enable index monitoring and query the V$OBJECT_USAGE view
D. enable index monitoring and view the DBA_INDEXTYPE_COMMENTS view

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按GB7588-2003《电梯制造与安装安全规范》规定,玻璃轿壁应使用夹层玻璃,应按表J1选用或能承受附录J所述的冲击摆试验。在试验后,轿壁的安全性能应不受影响。距轿厢地板1.10m高度以下若使用玻璃轿壁,则应在高度()之间设置一个扶手,这个扶手应牢固固定,与玻璃无关。

A. 0.90~1.10m
B. 1.00~1.10m
C. 1.05~1.15m

路基的作用是为路面提供一个平整层,承受路面传递下来的车辆荷载,是保证路面强度和稳定性的重要条件之一。

A. 正确
B. 错误

某电厂4月份因故障主变压器非计划停运2次,各停运10天。其中1次是第一类非计划停运,1次是第三类非计划停运,则该主变4月份的强迫停运系数是()。

A. 33.3%
B. 66.6%
C. 0
D. 10%

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