【判断题】In both FDMA and TDMA systems, a time-consuming frequency planning task is required whenever a network changes, whereas no such frequency planning is needed for a CDMA network since eachcell uses the ...
【简答题】Translate the following into Chinese Ultrasonography is useful in locating tumors of the lung and abdominal cavity. It employs ultra high frequency sound waves to form television images of internal or...