Chalk APP is an educational product of Beijing Chalk Blue Sky Technology Co., Ltd. and a vocational training platform to promote scientific and technological innovation. Founded on 20 15, it adheres to the principle of putting science and technology first, helps vocational education innovation with Internet technology, and provides users with products and services.

Zhonggong Education Group was established in 1999. After more than 22 years of painstaking development, Zhonggong Education has developed from an information technology and education service institution founded by Peking University graduates to a comprehensive enterprise group in the education service industry, and has become a large-scale knowledge industry entity integrating face-to-face teaching and training, online distance education, publication and distribution of books, teaching materials and audio-visual products. Zhonggong Education Group is a modern vocational education institution covering a wide city, with many full-time teachers and large-scale public vocational training.

Tax is a form of fiscal revenue, which is imposed on residents and non-residents by special government agencies based on political power and legal provisions, and is mandatory, non-punitive and not directly repayable for their property or specific behavior. In the process of developing socialist market economy, taxation bears the functions of organizing fiscal revenue, regulating economy and regulating social distribution. ?

The tax system is the department responsible for tax collection and management, which originally included the State Taxation Bureau system and the Local Taxation Bureau system, and was managed by State Taxation Administration of The People's Republic of China, People's Republic of China (PRC).