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【简答题】
己知二次函数y=x 2 +bx+c，当x=1时y=3；当x=-1时，y=1，求这个二次函数的解析式．
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【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】.
A.
正确
B.
错误
【单选题】开放性损伤后预防破伤风的有效措施是
A.
清创并注射青霉素
B.
清创并注射破伤风抗毒素
C.
注射破伤风类毒素
D.
清创并注射破伤风类毒素
E.
注射人体破伤风球蛋白
【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
【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...
【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 .
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
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