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此问题本身和解答中若干地方概念不清,甚至错误。提问中所称:“附图是某一交流信号”就是错的,实际图示的是脉冲直流信
The concept of the problem itself and the answer to a number of local concepts is unclear, or even wrong. Question said: “The picture is a certain exchange signal” is wrong, the actual pictorial is the pulse of DC