发布时间:2025-01-28 00:41:36
光缆和电缆完全是两个不同的东西
它们的传输介质完全不同,光缆的传输介质是玻璃纤维
电缆的传输介质是铜
一个奇怪的梦大概片段是这样的在刚装修好的家里我正要刷牙无意望向窗外外面居然一片白茫茫的
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