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简述对比敏感度视力的原理。

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工作临近其他带电体，工作负责人（）

A. 应对作业人员指明带电部位和应保持的安全距离
B. 可增加专责监护人员
C. 可安排监护人做其他工作
D. 可直接离开现场

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双支避雷针的保护范围（）两个避雷针保护范围的总和。

A. 小于
B. 等于
C. 大于
D. 不确定

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ABC公司每股利润为0.8元，市盈率为15，按市盈率法计算，该公司股票的每股价格为（）。

A. 12元
B. 14元
C. 15元
D. 18.75元

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You are peer reviewing a fellow DBAs backup plan for his NOARCHIVELOG mode database， as shown here： Put the tablespaces in backup mode. Back up the datafiles for all tablespaces. Take the tablespaces out of backup mode. Back up all archived redo logs. Your colleague asks for you to comment on his plan. Which response would be correct？（）

A. The plan will work as is.
B. The plan needs to be modified to allow for an archive-log switch after step 3.
C. The plan needs to be modified so that a backup of the archived redo logs occurs before step 1.
D. The plan needs to be adjusted to shut down the database after step 1 and to restart the database after step 2.
E. The plan cannot work as presented.

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