Recently pin timbering has been extensive used because the bolting of coal road has mellowed, however the problem of difficult tunnel reinforcement haven’t been solved properly, for example, wide span tunnel, heavy section.
近年来,随着煤巷锚杆支护技术日趋成熟,锚杆支护得到普遍推广应用,但是还不能很好解决大跨度、大断面等巷道支护加固问题。
参考来源 - 大跨度切眼巷道锚杆（索）支护技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
In a representative heavy section data base, be sometimes storing large amount of important private data.
在一个典型的大型数据库中，往往存储着大量重要的私有数据。
The defects that easy occurred in heavy section ductile iron castings as well as the prevention measures were reviewed.
概述了厚大断面球墨铸铁件易产生的几种缺陷及防止措施。
For the sake of the axis accessory's figuration, the experiment of second wedge heavy section shrinkage was carried out.
为了成形大断面收缩率轴类零件，进行了楔横轧二次楔入试验。
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