In this paper, some analysis and study have been done about the accidents, I found that a considerable portion of these accidents are due to structural damage caused by fatigue.

本文对多起塔式起重机事故进行了分析研究，发现这些事故中有相当一部分是由于结构的疲劳破坏引起的。

youdao

In this paper, some analysis and study have been done about the accidents, I found that a considerable portion of these accidents are due to structural damage caused by fatigue.

本文对多起塔式起重机事故进行了分析研究，发现这些事故中有相当一部分是由于结构的疲劳破坏引起的。

youdao