Strengthening the knothole position arranging and design of the head, etc.
加强板的布置位置及其端头的设计等。

Partial stability in welder beam stemach knothele with the maked of the strength after considering the crook
焊接工字梁腹板的局部稳定和考虑屈曲后强度的计算

Used for the refrigerator to behind carry on the back the knothole Obstruct to burn hollowness the plank, and also can used for the refrigerator bottom
用于冰箱后背板的阻燃中空板，也可用于冰箱底托

Tube and Tube Knothole Connect with Each Other
管与管板的相连