Dynamic mechanical performances of 30CrMnSiNi2A alloy steel under high pressure of 1-15 GPa are studied with a one stage light gas gun. With the particle velo
Objectives To study incidence characteristics and causes of injury, and its medicalconsequences in school children of China. Methods A total of 2 553 school chi
In recent years, many coal-producing countries have paid great attention to the land subsidence causedby coal cutting. In China, because of the dense population
The recombinant adeno-associated viral vector with human coagulation Factor Ⅸ minigene which was regulated by CMV promoter was constructed. Large quantity of r