The roof of the exhibition center is a cable tensioned box steel shape beam structure, and the roof of the reception hall and the conference center are I shape steel beam structures.

展览大厅的屋面为弧形大跨度拉索焊接箱型钢梁结构，接待厅和会议中心的屋面为工字型钢梁结构。

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Electromotor ventilation section shape is similar to the I beam and H beam.

电机通风用异形钢材是一种机械零件，其断面形状类似工字钢和H型钢。

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This essay makes quantitative description, taking rectangular section beam and I-shape section beam as examples respectively, in order to eliminate the doubt of students.

本文分别以矩形截面梁和工字形截面梁为例对此问题进行定量描述，以此消除教学中学生的疑义。

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