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大家都知道电话光端机配件用到的不只是电话，还有电话线，那么电话线两芯和四芯有区别吗？电话线一般分为2芯，4芯,(4芯适用于公司或部分集团电话使用)，6芯(6芯适用于数字电话使用)。 两芯标准的电话水晶头是RJ32。分别称为A线、B线，没有正负极的区别。至于听筒的四芯线…
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