wwwav在线播放_精品国产一区二区三区不卡蜜臂_国产成人亚洲中文字幕视频_老熟女高潮喷了一地_亚洲精品视频中文字幕_国产亚洲欧美日韩在线观看一区二区

Lian, Y.S., Deng, J.X., Li, SH.P., Yan, G., Lei, SH.T., Friction and wear behavior of WS2/Zr self-lubricating soft coatings in dry sliding against 40Cr-hardened steel balls. Tribology Letters (53, 1), 2014, 237-246.