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【简答题】
如图题6-13所示,两长度为8的有限长序列h 1 (n)和h 2 (n)是循环位移关系,试问: (1)它们的8点离散叶变换的幅度是否相等? (2)用h 1 (n)和h 2 (n)作为单位脉冲响应,可构成两个低通FIR数字滤波器,试问这两个滤波器的性能是否相同?比较之。
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参考答案:
举一反三
【判断题】堇青石最大的特点是膨胀系数很低,为1.1~1.8 ×10 -6
A.
正确
B.
错误
【简答题】蛋白质水溶液是一种比较稳定的亲水胶体,其稳定性主要因素有两个,分别是 和 。
【简答题】蛋白质水溶液是一种比较稳定的亲水胶体,其稳定性主要因素有两个,分别是 和 。
【简答题】— This project is too big for me to finish on time. —________________. A: Please do me a favor B; That is a daydream C; I'll give you a hand
【单选题】—Can you help me, Dad? —Sure. But please wait a few minutes until I finish________ my email. [     ]
A.
write
B.
writing
C.
to write
D.
in writing
【简答题】蛋白质水溶液是一种比较稳定的亲水胶体,其稳定性主要因素有两个,分别是 和 。
【单选题】听力原文:W: Professor Johnson will finish his speech soon. If you want to see him, please wait for a moment. M: No, thanks, I'll leave a note for him. W: I'll send it to him as soon as possible. What does...
A.
Send a note to Professor Johnson.
B.
Wait a minute to see Professor Johnson.
C.
Write a note to Professor Johnson.
D.
Listen to Professor Johnson's speech.
【简答题】( )是一项由英格兰,苏格兰和北爱尔兰旅游局联合支持的连续性国内旅游调查
【简答题】蛋白质水溶液是一种比较稳定的亲水胶体,其稳定性主要因素有两个,分别是 和 。
【判断题】The author's family decided to move back to the convenient city life after going through too many difficulties in the countryside.
A.
正确
B.
错误
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