Which of the following are true statements regarding the characteristics of OSPF areas? Select all that apply.（）
All OSPF networks require the use of multiple areas
B. Multiple OSPF areas must connect to area 0
C. Single area OSPF networks must be configured in area 1
D. Areas can be assigned any number from 0 to 63535
E. Area 0 is called the backbone area
F. Each OSPF area need to be configured with a loopback interface
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信号集中监测系统由车站子系统、服务器子系统、终端子系统、维护工作站子系统组成。
A. 正确
B. 错误
多人合影照人物排列时，要照顾人物（），衣服颜色等关系，使画面布局均衡构图合理。
A. 主次、高矮、胖瘦
B. 男女、高矮、表情
C. 男女、情绪、胖瘦
D. 主次、男女
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