夜夜躁狠狠躁2021,在线国产精品一区,午夜一级视频,精品视频三区,国产一级全黄,久久天堂国产香蕉三区,嫩草影院一区二区

How to distinguish indoor optical cable from color?

release:admin Browse:4453 times

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