【判断题】The phase margin of a second-order system (with no zeros) is a function of both the damping ratio【图片】 and the natural frequency, 【图片】.
【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】正常颅内压为(),、当成人颅内压持续高于1.96kPa时,即为颅内压增高。
【判断题】From , it can be seen that for ζ >0.707, there is no resonant peak. The magnitude decreases monotonically with increasing frequency ζ . The magnitude is greater than 0 dB for all values of .
【单选题】An open pipe of air supports standing waves at frequencies of 300 Hz and 400 Hz. There are no other frequencies between these two. What is the frequency of the second harmonic of this tube?