beam forms

With the comprehensive development of highway and urban tridimensional traffic, bridge construction has entered the unprecedented golden period with the rapid development. Box girder, by its unique merits, has long been the main beam section forms.

随着公路及城市立体交通的全面发展，桥梁建设进入了前所未有的飞速发展的黄金时期，其中箱形梁以其特有的优点，已成为大跨径连续梁桥和连续刚构桥主要的梁截面形式。

However the commonly used rectangular beam will easily forms uneven hardened case, which is thin on the side and thick on the middle, this will affect the quality of laser hardening.

激光相变硬化层分布的均匀性是理论研究和实践中追求的目标之一。目前普遍采用的激光光斑形状，易形成中间厚、两边薄的月牙形硬化层，影响了相变硬化效果和质量。

Then a crest slab is fixed on the beam, which forms the roof.

然后将顶板固定在房梁上，形成屋顶。

The forms of prostate cancer included radical prostatectomy external beam radiotherapy and brachytherapy.

前列腺癌治疗包括根治性手术、外放疗和组织间近距离治疗.