不好意思 打错了：我是做HBV, HBVB室内电话线，但是客户要的是HYV, HYY 和合HYYC电话线，请问高手：它们有什么区别？这里的H,Y,V,B,C各是什么意思呢？谢谢
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我是做HBV, HBVB室内电话线，但是可以要的是HYV, HYY 和合HYYC电话线，请问高手：它们有什么区别？这里的H,Y,V,B,C各是什么意思呢？谢谢
