个案研究中，诊断问题的症结所在，通过推论寻找原因，并可以将原因分为（）。 ["主因","次因","远因","近因","内因","外因"]
社会等级
克里斯托的装置作品被称作地景艺术或大地艺术。
You want to allow Router R1 to immediately become the active router if its priority is highest than the active router fails. What command would you use if you wanted to configure this？ （） [" en standby preempt"," standby preempt enable"," standby preempt"," hot standby preempt"]
由两种原色调和而成的色彩叫复色。
司马迁，字（），西汉阳夏人，是我国历史上著名的史学家和文学家，著有我国第一部纪传体通史（）。
