法律规定，什么是国内快递业务？
Which statement correctly describes a situation in which VRFs are used in the data center？（） [" Partitioning of network resources is enabled."," VRFs cannot support path isolation from MAN\/WAN designs."," VRFs cannot be used to map a virtualized data center to a MPLS implementation."," VRFs do not allow for the use of application services with multiple access topologies."," An access design using a VRF allows for an aggregation layer service module solution."]
我国适用信守国际条约的原则，在下列哪些情况下除外（）。 ["我国未缔结或者未参加的国际条约","我国缔结或者参加国际条约时已声明保留的条款","我国与第三国订立的双边协议","我国缔结或者参加国际条约时未声明保留的条款"]
确定在本地区建港后，选择建港具体地点起决定性因素的是（） ["港口与城市协调关系","当地的自然条件","港口集疏运方式","环保要求"]
在中国（）时代自然事物真正作为审美对象进入人的视野。
中国古代美学家中，把“情”与“景”、“心”与“”物结合起来认识的是（）
