杨幂大战老外三分钟四十八秒_国产果冻传媒精品AA片在线_国产成人精品无卡无码AV在线_成在线人a∨免费无码高潮喷水_青青青亚洲精品国产_伊人俺去久久涩五月综合_变态+美女+日本漫画_性开放性开放交友网站_按摩师添我下面好舒服_日本中文字幕有码

Plastic extruder is a kind of common plastic mechanical equipment. In the process of daily operation of extruder, there are various failures of extruder, which affect the normal production of plastic …

Feeding area of plastic extruder: fixed screw groove depth, which is responsible for preheating, conveying and pushing of plastic solids. The plastic needs to start melting at the end of the feed sect…