根据噪声的性质,噪声可分为脉冲噪声、起伏噪声和()。
A.多频噪声
B.单频噪声
C.交调噪声
D.系统噪声
正确答案是B
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One of the most important wayspeople have of communicating is done non-verbally, or without the use of words.Just as a bird watcher delights in watching birds, so the non-verbalistdelights in wa