单点平行梁结构，铝制传感器；
该仪器索赔16 ，进一步组成的第三次和第四次交叉梁连接平行的第一届和第二届跨梁，分别。
The apparatus of claim 16, further comprising third and fourth cross beams connected parallel to the first and second cross beams, respectively.
借助与桁架对应的梁的剪力图和弯矩图根据两个关系式可直接求出一般平面平行弦桁架任一根杆件的轴力。
For a complanate parallel chords truss, the axial forces of a member can be solved by the shear-diagram and two simple expressions.
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