Which two models are the models of DiffServ-Aware Traffic Engineering？ （） ["Policy-based Model","Class based Model","Russian Doll Model","Global Tunnel Model","Maximum Allocation Model"]
What is a reason for implementing MPLS in a network？（） ["MPLS eliminates the need of an IGP in the core.","MPLS reduces the required number of BGP-enabled devices in the core.","Reduces routing table lookup since only the MPLS core routers perform routing table lookups.","MPLS eliminates the need for fully meshed connections between BGP enabled devices."]
正常运行中油箱油位降低的原因有哪些？
早期维新思想家郑观应认为，根据《万国公法》，“各国之权利，无论为君主、为民主、为君民共主，皆其所自有，决无可以夺人与甘夺于人之理”。这说明（）。 ["郑观应主张建立君主立宪制度","先进知识分子关注近代外交常识","早期维新派还带有自大的思想","挽救民族危亡成为时代的主旋律"]
活动目录的对象有（）、（）、（）等。
直接影响
