简答备份网元数据库的目的。
参考答案：
主要是为了在主控板丢失数据或设备掉电后，网元能自动恢复运行。
theater
A．treasure
B．wheat
C．season
D．realize
________ did you spend on the skirt? [ ]
A. How many
B. How long
C. How much
D. How often
