五十路亲子中出在线观看,欧美成年人电影,黑人欧美一级毛片,xart欧美在线播放精品4k,男女羞羞视频网站免费,午夜爱爱影院,日韩午夜高清福利片在线观看

How to distinguish indoor optical cable from color?

release:admin Browse:4628 times

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