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请问:老的拨转盘的电话机之间接多少伏的电压?交流还是直流? |
发表于 2021-3-29 19:26:15
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发表于 2021-3-28 20:04:18
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发表于 2021-3-28 20:39:23
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发表于 2021-3-28 20:54:38
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发表于 2021-3-29 07:00:36
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