排列五和值走势图

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对讲机


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无线对讲机和有线电话机在接听时有很大区别的

发布日期:2019-01-10 00:00 来源:http://pcckw.com 点击:

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大连对讲机在使用中,对讲机长时间处在守候状态,当收信机无信号输入时,内部噪声可在音频输出端产生较大的噪声,扬声器会发出很大的“沙沙”声,这主要是因为对讲机的收信部分灵敏度高,增益大而产生,这种噪声令人厌烦,对使用者造成干扰和听觉上的疲劳。


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大连对讲机

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