<th id="vhy72"><progress id="vhy72"></progress></th>

  1. <strong id="vhy72"><dl id="vhy72"></dl></strong>

    1. 欧美一级婬片A片无码区|超碰AV成人|亚洲一区三区|一本一道无码免费看视频|日韩妞妞黄色网|欧美亚中文网|东京干视频|亚洲av操|日韩av天|特黄AAAAAAA

      JINGHONG

      H-beam

      H-section steel is an economic section efficient section with a more optimized cross-sectional area distribution and a more reasonable weight-to-weight ratio. It is named because its section is the same as the English letter "H". With each part of the H-beam arranged at a right angle, the H-beam has advantages of strong bending resistance, so it is widely used in simple construction, cost saving, light weight structure and son on.

      < 123 >
      欧美一级婬片A片无码区|超碰AV成人|亚洲一区三区|一本一道无码免费看视频|日韩妞妞黄色网|欧美亚中文网|东京干视频

      <th id="vhy72"><progress id="vhy72"></progress></th>

      1. <strong id="vhy72"><dl id="vhy72"></dl></strong>