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【简答题】
) 中含有的官能团的名称是____; 中含有的官能团的名称是____。
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【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 ...
A.
正确
B.
错误
【单选题】当颅内压增高时,下列叙述哪项不正确
A.
婴幼儿、老年人出现症状早
B.
与病变的扩张速度有关
C.
颅脑中线的占位病变出现症状早
D.
高热往往加重颅内压增高
E.
脑灌注压下降
【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。
【单选题】当颅内压增高时，下列叙述不正确的是（）
A.
婴幼儿、老年人出现症状早
B.
与病变的扩张速度有关
C.
颅脑中线的占位病变出现症状早
D.
高热往往加重颅内压增高
E.
脑灌注压下降
【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 .
A.
正确
B.
错误
【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?
A.
100 Hz
B.
200 Hz
C.
400 Hz
D.
600 Hz
【简答题】In the former case the audio-frequency signal from the microphone, with little or no amplification, is used to modulate the output of the oscillator, and the modulated carrier frequency is then amplif...
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