设备某支路板的一个通道有T-ALOS告警，可能原因（）
A. 光缆故障
B. 设备进行了保护倒换
C. 设备接口板故障
D. 与该通道口相连的交换机中继口或中继电缆故障
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外拉线抱杆组塔法，抱杆上拉线的地锚应设置于铁塔（）。
A. 基础对角线的延长线上
B. 基础四边的中点延长线上
C. 基础四边的任意点
D. 相邻基础连线的延长线上
RMAN provides more granular catalog security through which feature？（）
A. Virtual private database
B. Virtual private catalog
C. RMAN virtual database
D. RMAN secure catalog
E. Oracle Database Vault
Which two statements are true about a Work Item with "Open" Notification? （）(Choose two.)
A. The Work Item is not eligible for Purge.
B. The Work Item is eligible for a Permanent purge.
C. The Work Item is eligible for a Temporary purge.
D. The Work Item is not complete because it still has "Open" Notification.
E. The Work Item is eligible for both Temporary and Permanent purge.
平均发展水平又称为（），是对一定时期内的各期发展水平求得的平均数。
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