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为什么老式接口一定要分正反？ - 知乎
source link: https://www.zhihu.com/question/322763515/answer/671860443
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技术难点并没有，成本而已。正反可插的实现很简单，用两套触点就好了。以USB-C为例：公头母头都需要24个…
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