1. Boiler steel structure consists of roof, column, girder, vertical and lateral supporting, while roof comprising of girder, secondary beam, trabecula and forming a firm box. 锅炉钢结构由顶板，柱和梁，垂直支撑，水平支撑等部件组成，顶板由主梁，次梁和小梁组成一个坚固的梁格，其四周有水平支撑，主梁端有垂直支撑。
2. A box girder is much the same as an I-beam girder except that, obviously, it takes the shape of a box. 阿箱梁是大致相同的工字钢梁外，显然，它的形状方块。
3. A box girder is much the same as an I-beam girder except that, obviously, it takes the shape of a box. 阿箱梁是大致相同的工字钢梁外，显然，它的形状方块。
4. Using axicon-based optical devices can realize such transformations as Gauss' beam into a diffraction-free Bessel beam, solid beam and annular beam converting each other. 应用旋转棱镜和组合光学系统能够将高斯光束变换成“无衍射”贝塞尔光束，并能实现实心和环状光束的相互变换。
5. When prior girder's section is smaller or the concrete's intensity is lower, the supporting structure can be replaced by bearing spandrel which is added to the girder's sides. 当原梁截面较小或混凝土强度较低时，张拉预应力的支承结构可由梁两侧增设的承压钢梁充当。
