煤矿巷道锚杆支护技术规范Technical specifications for rock bolting in coal mine roadways2018-5-10发布2018-12-01实施中华人民共和国国家质量监督检验检疫总局中国国家标准化管理委员会目录前言IV1范围1英雄联盟上单2规范性引用文件13术语和定义1善于学习4技术要求64.1现场调查与巷道围岩地质力学评估6孕妇能吃乌梅吗4.2
First-principles calculations of electronic structure and optical properties of Boron-doped ZnO with intrinsicdefectsYen-Chun Peng,Chieh-Cheng Chen,Hsuan-Chung Wu ⇑,Jong-Hong LuDepartment of Materials
超前支护过煤层施工技术Combination of Advanced Bolting and Posts AppliedcowardinConstruction of Crossheading Through Coal SeamSongphiladelphiaYu(Qianjiaying Mining Branch Company . Hebei, Tangshan,063301)Abstract