双支避雷针的保护范围()两个避雷针保护范围的总和。
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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
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.
TD-SCDMA相比与GSM有哪些优点?()
A. 速率快
B. 硬切换
C. 发射功率低
D. 多用户接入