[請益] USB延長線有的能用有的不行?
手邊有兩條USB延長線,但發現分別用行動硬碟、藍芽器以及隨身碟連接
卻發現有的可以用有的不能用,這兩條線都是標準型接頭
兩頭分別是一公一母
圖片==>http://ppt.cc/bWvW
測試結果如下:
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| |行動硬碟|隨身碟|藍芽器|
-----------------
| A線 | X | V | X |
-----------------
| B線 | V | V | V |
-----------------
另外請問B線圈起處哪顆黑黑的東西是什麼?功能是?
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