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."]
我国古典园林不存在的形式是（） ["皇家园林","私家园林","寺庙园林","风景名胜园林"]
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"]
现代物流管理的特征表现在（）。 ["以实现顾客满意为第一目标","以企业的整体最优为目的","以信息为核心","物流单环节上的优化"]
井点降水方法的种类有哪些？各适用什么范围？
