When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the interface clock rate determined（）。 ["It is supplied by the CSU\/DSU.","It is supplied by the far end router.","It is determined by the clock rate command.","It is supplied by the Layer 1 bit stream timing."]
一用电器测得其阻值是55Ω，使用时的电流为4A，则其供电线路的电压为（）V。 ["100","110","200","220"]
What is one benefit of PVST+?（） ["PVST+reduces the CPU cycles for all the switches in the network","PVST+automatically selects the root bridge location,to provide optimiz…","PVST+allow the root switch location to be optimized per vlan.","PVST+supports Layer 3 load balancing without loops."]
根据《水利水电土建工程施工合同条件》通用条款，判断下列哪些说法是正确的？（） ["监理人的检查和检验不免除承包人按合同规定应负的责任","监理人参加交货验收不免除承包人在检验和交货验收中应负的责任","没有监理人的指示，承包人不得擅自变更","监理人有权变更施工合同的权利和义务关系","监理人的检查和检验可以免除承包人按合同规定应负的责任"]
不是组团绿地布置的方式的是（） ["开敞式","半封闭式","封闭式","混合式"]
提高产业的承受能力，换言之，就是（）要和城镇化产业互动。
