【多选题】NB-IOT 物联网与传统移动蜂窝网有哪些优势?( )
【单选题】(2) Your car needs .
【简答题】At the time when their parents were young, a lot of modern necessary equipment owned by young people now was regarded as ______.
【单选题】设向量 a =(1,0), b = ,则下列结论中正确的是 [ ]
【单选题】The time when a lot of people are travelling to or from work and so roads and trains are very busy
【判断题】测量的基本工作是平面控制测量和高程控制测量。( )
【单选题】设a、b、c均为非零向量,则与a不垂直的向量是:()