pulmonary-edema
发表于 2025-3-28 17:09:42
Mahmoud Tavassolie following common problems are faced: ① When the working face advances to special areas (such as connecting lanes), it is easy to induce rockburst and large-area abnormal pressure disasters; ② During the final mining period of the working face, the unreasonable design of the stop line position caus
革新
发表于 2025-3-28 20:45:11
Mahmoud Tavassoliphies of the pioneers in the field.This textbook covers fundamentals of rocket propulsion such as history, classification, qualitative design, quantitative design of internal ballistics and rocket vehicle optimization. It is intended to be used as a textbook by the undergraduate/advanced undergradua
镀金
发表于 2025-3-29 01:11:26
Mahmoud Tavassoliacts and insights from previously classified military projec.The Cold War saw scientists in East and West racing to create amazing new technologies, the like of which the world had never seen. Yet not everyone was taken by surprise. From super-powerful atomic weapons to rockets and space travel, rea
dissent
发表于 2025-3-29 04:34:36
Mahmoud Tavassoliriving and resisting forces. The driving forces or processes are the methods by which energy is exerted on earth materials and include both surface, geomorphological or exogenous processes and subsurface, geological or endogenous processes. The resisting forces are the surface materials with their i