国产办公室紧身裙丝袜AV在线_国产操逼视频免费看_中文字字幕无线视频_韩国电影一区2区3区

So far, the most common technologies have been used are open mill mixing and internal mixer mixing, which are called non-continuous mixing. Based on the advantages of both open mill and internal mixer, we have designed the “screw mixing machine” in continuous mixing method and of high efficiency with the strong points as follow.