The closed-loop system filters out the signal components whose frequencies are greater than the cutoff frequency and transmits those signal components with frequencies lower than the cutoff frequency.
A.
正确
B.
错误
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【简答题】81-year-old man helped poor students On December 2, 2009, in No.1 High School, Yaling Town, Yichuan County, Luoyang, an old man with a stick is taking 300 notebooks and 120 ball pens out of a bag. He ...