脉冲拨号
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什么是脉冲拨号？(pulse dialing?)
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- ddvdfr7689 发布于 2021-12-14 14:45
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单音拨号(tone dialing)和脉冲拨号(pulse dialing)的区别
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- rm24009 发布于 2021-06-23 04:17
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