若一个联系涉及到两个实体则称为二元联系，若只涉及到一个实体则称为一元联系。
三相三线有功电能表，功率因数为0.5（C），当（）时表计停走。 ["A相电流接反","A相无电压","C相无电压","C相无电流"]
Your network contains a server named Server1 that runs Windows Server 2003 Service Pack 2 （SP2）. Server1 has IPSec enabled. Several users report that they cannot connect to Server1. You need to see how many IPSec connection attempts failed due to authentication failures. What should you do？（） ["From IP Security Monitor， view the Main Mode Statistics.","From Microsoft Baseline Security Analyzer， scan Server1.","From the Security event log， view the events from the IPSec source.","From System Monitor， add the IPSec V4 Driver ： Active Security Associations counter."]
酶发酵的生产方式：（）。其中最理想的酶合成模式是。
绿色发展：为全球生态安全作出新贡献，其要求主要表现在（）。 ["促进人与自然和谐共生，构建科学合理的城市化格局、农业发展格局、生态安全格局、自然岸线格局，推动建立绿色低碳循环发展产业体系","加快建设主体功能区，发挥主体功能区作为国土空间开发保护基础制度的作用","推动低碳循环发展，建设清洁低碳、安全高效的现代能源体系，实施近零碳排放区示范工程","全面节约和高效利用资源，树立节约集约循环利用的资源观"]
简述组织的结构变量？
