Dafengkou相关论文
通过对河南禹州华夏植物群与含煤地层的研究可知,河南省禹州市神垕镇与磨街乡之间的大风口一带,石炭二叠纪含煤地层出露总厚度超过......
介绍了大风口隧道的工程概况,详细阐述了进洞施工的技术要点。...
In western Henan, Late Palaeozoic coal measures are completely developed and well exposed. A great deal of research work......