国内久久av,高清中文av,亚洲va欧美va国产综合久久,国产精品久久性,波多野结衣久久久久,精品一久久,狠狠操狠狠干视频

In the R&D center, we equip with all facilities necessary for the research and product development, these equipment include: various chemical, optical and physical measuring instrument, two roll mills, brabenders, lab extruders, congo red test machine, all sorts of mixers, ovens, all sorts of instruments for test of raw material property and performance etc..