日本在线播放-亚洲色图在线观看-欧美黄视频-在线视频一区二区三区-黄色免费视频网站-外国毛片-蜜桃成人av-婷婷射-蜜桃视频一区二区-日本精品中文字幕-免费黄色av网站-国产精品天天狠天天看-午夜快播-激情文学88-嘛豆视频-黄色高潮视频-小辣椒导航-看黄色的网站-91色国产-毛片黄片免费看-河北彩花av在线-狠狠狠狠操-第四色av-www.五月激情-91香蕉视频污污-国产主播一区二区三区-欧美视频一二三-91av国产精品-调教少妇视频-日韩av一区二区在线播放

The DH series steel truss is designed and manufactured for replacing the solid H steel girders with roof or floor girders in steel structure buildings.

H steel, square steel tube or rectangular steel tube are used as chords, and square steel tubes or rectangular steel tubes are used as abdominal members.

In steel structure buildings, steel truss beams are used for roofing or floor construction instead of real H steel girders.

A girder structure, such as a 12~36 metre span roof or floor girders.