Meng Xiaozi's library is overloaded, so you can delete some unnecessary ones. Meng Xiaozi Library serves the vast number of scientific researchers. The value of existence lies in facilitating the scientific research activities of researchers and saving the time of searching and downloading documents. Meng Xiaozi has been committed to promoting scientific and technological progress and social development since its establishment. It is free and public welfare, and insists on charging for various services free of charge or as little as possible.