天天躁日日躁狼狼超碰97,成人性生交大片免费,www插插插无码免费视频网站 ,免费男人下部进女人下部视频

How to distinguish indoor optical cable from color?

release:admin Browse:4532 times

Yellow represents single-mode optical cable; Orange represents multimode optical cable; Some manufacturers use blue to represent multi - mode million optical cable.