久久狠狠高潮亚洲精品_久久精品女人热_欧美日韩中文字幕专区一二三_久久久久又大又湿又高潮

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.