少妇做受xxxxⅹ高潮片_国产亚洲日韩在线AAAA_免费AV无码专区久久网站_麻豆成人久久精品二区三区免费_国产内射老熟女AAAA∵_国语自产精品视频在线九九_亚洲特级毛片视频

  Straightening machine is a straightening equipment for metal profiles, bars, pipes, wires, etc. The straightener changes the straightness by extruding the bar with straightening roller. Generally, there are two rows of straightening rolls with different quantities. There are also two roll straighteners, which straighten materials with different diameters depending on the angle change of two rolls (concave in the middle, hyperbolic roll). The main types are pressure straightener, balance roll straightener, shoe roll straightener, rotary reverse bending straightener and so on.