日韩Av无码中文字幕,av人摸人人人澡人人超碰下载,我的公强要了我高潮,国产精品久久久久野外

　　Pure carbon or dip metal board is installed on the electric locomotive pantograph, from the current collection on a suspension cable sliding contact point. A powder metallurgy skateboard small friction coefficient, small spark, operation can significantly the service life of hunhe line and basically eliminated interference with radio waves: the company is China's early development of various types of carbon board manufacturers, product quality excellent, suitable for blended with copper wire or copper - steel aluminum frame matching using wire. C26 leaching copper carbon skateboards, high-speed locomotive with bow skateboard and C27 and C28 carbon type, long article in recent years, the company is committed to the high performance of pure carbon slide, been put into use, good use effect.