首先介绍了我国规范中的排架柱的计算长度的历史背景，并指出其中存在的问题。

We first introduce the background of the effective length of bent column of the code, and point out the exist problems.

youdao

并指出其中存在的问题和今后值得研究的方向。

Then, existing problems are pointed out and work need to be done in the future is suggested.

youdao

本文介绍了皖北地区农业产业化的概况，指出了其中存在的主要问题并提出了一些相关的建议。

This paper presents the general situation of the agricultural industrialization of the north of Anhui province, points out some main problems and gives some advice.

youdao