Your company has an Active Directory domain. You install an Enterprise Root certification authority （CA） on a member server named Server1. You need to ensure that only the Security Manager is authorized to revoke certificates that are supplied by Server1. What should you do（） ["Remove the Request Certificates permission from the Domain Users group.","Remove the Request Certificates permission from the Authenticated Users group.","Assign the Allow - Manage CA permission to only the Security Manager user account.","Assign the Allow - Issue and Manage Certificates permission to only the Security Manager user account."]
压力表的表盘刻度极限值最好为工作压力的（） ["一倍","二倍","三倍"]
钢管进场检验，外观检查应满足以下条件（） ["焊缝表面不得有裂纹、断弧、烧穿","焊缝表面不得有弧坑、气孔","焊缝表面不得有深度超过0.5mm的咬边","钢管表面无超过壁厚负偏差的锈蚀","钢管表面无超过壁厚负偏差的凹陷"]
Andrews和Withey（1976）又提出了主观幸福感的第三个维度（） ["正性情感","认知维度","生活满意感"]
设一个关系为R（A，B，C，D，E），它的最小函数依赖集为FD={A→B，A→C，（C，D）→E}，该关系只满足（），若要规范化为第三范式，则将得到（）个关系。
试述非正式群体的含义及特点？
