... 校验系统之各种要求：calibration system requirements 中心光束法：center beam method 集中式投射线：central projection ...
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Therefore, the paper expatiates counter-arched method of long span box beam-iteration, and the process of counter-arched calculation of Shenzhen conference and exhibition center.
为此，本文阐述了大跨度箱形梁的预拱确定方法——逆迭代法，并以深圳会展中心箱形梁为实例说明计算过程。
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