阿Q吧 > 为什么耳机插头有的有3道黑圈，有的只有2道黑圈

为什么耳机插头有的有3道黑圈，有的只有2道黑圈

2025-03-16 17:08:12
推荐回答（1个）
回答1：

大多手机是用3圈的，mp3可能是两圈的。三圈的插手机如果只插两圈可能是伴奏

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