It is to be square-a span long and a span wide-and folded double.
这胸牌要四方的，叠为两层，长一虎口，宽一虎口。
FIG. 12 illustrates a timber double post roof truss. This type of truss is constructed where a wider span or a less restricted roof space is required.
图12所示为一个双柱木屋顶桁架。这种桁架主要建于跨度要求较大或屋顶空间限制较少的地方。
In excavation of double span tunnel, there exists a big water-eroded groove. The method of elastic foundation beam is used to cope with the situation.
双跨隧道在岩溶地区施工中遇到大型溶槽，采用弹性地基梁法成功跨越。
The main bridge of Sanmenjiang Bridge in Liuzhou is a 3-span partial cable-stayed prestressed concrete box beam bridge with two pylons and double cable planes.
柳州三门江大桥主桥为双塔、双索面、三跨部分斜拉预应力混凝土箱梁桥。
A 3-d model of 2-span double continuous composite beam was established by using ANSYS software to validate the accuracy of this method.
用有限元软件ANSYS建立2跨双层连续组合梁的空间模型对该方法的准确性进行验证。
A 3-d model of 2-span double continuous composite beam was established by using ANSYS software to validate the accuracy of this method.
用有限元软件ANSYS建立2跨双层连续组合梁的空间模型对该方法的准确性进行验证。
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