久久精品国产成人av,亚洲伊人精品酒店,国产精品15p,国产色诱av,久久aⅴ国产欧美74aaa,91p亚洲,国内精品久久毛片一区二区

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.