问题
单项选择题
下列影响计算机控制系统的采样周期的因素，说法错误的是（）。
A.加到被控对象的扰动频率越高，采样频率应愈高，即采样周期愈短
B.当对象的纯滞后T0较大时，采样周期也应相应增长
C.若采用反应较慢的气动执行器，采样周期应比较短
D.采样的信号个数越多，采样周期应越长
答案
参考答案：C
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下列影响计算机控制系统的采样周期的因素，说法错误的是（）。
A.加到被控对象的扰动频率越高，采样频率应愈高，即采样周期愈短
B.当对象的纯滞后T0较大时，采样周期也应相应增长
C.若采用反应较慢的气动执行器，采样周期应比较短
D.采样的信号个数越多，采样周期应越长
参考答案：C
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| A French writer tells a story about his cat and parrot. A friend of 1 came to visit him one day. The friend said, "I'm going away 2 a short time. Will you please 3 my parrot for me?" The writer said he would do 4 , and his friend 5 the parrot to the house. The cat saw the parrot and wanted to know if it was a bird 6 not. 7 so, it 8 nice to eat. Very slowly the cat came 9 . It was thinking 10 nice it would be to have this animal 11 its meal. The poor parrot was 12 afraid. It kept 13 and 14 move until the cat was near enough to jump on it. Then, suddenly, the parrot said, "Haven't you 15 your breakfast?" The cat was afraid. It ran away as 16 as it could. 17 it 18 to 19 , "That thing can speak. It 20 a bird. It must be a man." |
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