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四芯电话线
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![四芯电话线](http://image.ec21.com/image/tyflj88/oimg_CG00275601/四芯电话线.jpg)
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Product standard: TYF/EIA/TLA-568A,TYF/EIA/TLA-568B, having reached the standard of FLUKE and passed the information link testing.
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