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"," Multiple OSPF areas must connect to area 0"," Single area OSPF networks must be configured in area 1"," Areas can be assigned any number from 0 to 63535"," Area 0 is called the backbone area"," Each OSPF area need to be configured with a loopback interface"]
Flash MX的帧频率是每秒12帧，通常电影、电视（PAL和NSTC制式）分别采用了每秒（）幅画面的速度拍摄播放。 ["24、25、30","24、26、28","24、25、26","24、25、28"]
（《文赋》的）文章十体说
On what kinds of networks does OSPF elect a backup designated router?（） [" Point-to-point"," Point to multipoint"," Broadcast"," Non-broadcast multi-acce"]
试述安全与生产的关系。
项目实施过程中，项目经理的主要项目管理活动包括：（）、（）和（）。
