问题:考虑到设备的安装,机房还需要有一定的高度,机房的最低净高一般不低于()米。...
Thursday, September 22, 2022
Thursday, September 22, 2022
问题:单选题IEEE802.11a标准采用()调制方式。A FHSSB DSSSC OFDMD MIMO...
Wednesday, November 29, 2023
问题:微波波段用的()必须具有低频谐振电路的基本性能,此外波道系统的谐振腔必须封闭,以免辐射。...
Thursday, September 22, 2022
问题:单选题超高频(SHF)波长范围()A 10—1米B 10—1分米C 10—1厘米...
Wednesday, September 28, 2022
Friday, September 16, 2022
问题:填空题无线电波在传播过程中,由于能量的扩散和媒体的吸收,随着距离加大,电波的能量将逐渐()场强将逐渐()。...
Friday, November 18, 2022
Thursday, September 22, 2022
问题:密集市区站址与现网基站距离2G一般为()米,3G/4G一般为()米。...
Friday, September 16, 2022
问题:为什么在选中继段的剖面时,总希望地形越起伏不平越好,而尽可能避免选择平原或大湖泊的剖面?...
Saturday, September 17, 2022
问题:占用带宽的测量方法通常为()和频谱分析x-dB法。...
Sunday, September 18, 2022
Thursday, September 22, 2022
Thursday, September 22, 2022
Monday, September 19, 2022
问题:无线工作站STA是基于()条件决定是否发起漫游的改变。...
Thursday, September 22, 2022
Sunday, March 10, 2024
问题:在微波通信中共用天线时几乎都采用()集体排列方案。...
Thursday, September 22, 2022
问题:单选题VHF电磁波的传输距离可达()公里。A 数十B 数百C 数千D 数万...
Thursday, March 16, 2023
Thursday, September 22, 2022
问题:问答题利用无线市话通信天馈系统远程监测技术可发现天馈部分哪些问题。...
Sunday, June 25, 2023