PON的光功率下行波长为（），必须用专门的EPON光功率测试仪进行测量，一般的光功率计不能测量。

A. 关注员工八小时以外的行为
B. 贯彻合规履职谈话和合规辅导制度
C. 及时发现员工的反常行为，并采取必要的措施
D. 对经济背景较为复杂的员工，加大关注力度
E. 建立社区家庭走访及其他重大事项报告制度

A. It is the time period after which the undo data becomes obsolete.
B. It is the time period after which the committed undo data would be transferred to a temporary tablespace.
C. It is the minimum time period up to which the committed undo data would be retained if free undo space isavailable.
D. It is the time period after which the undo data is transferred to the Flash Recovery Area to provide readconsistency.