What are the visa & residency requirements in China?

"To apply for a visa to China, a valid passport and other appropriate documents, such as a visa application form and a recent passport-style photograph, must be supplied. Depending on the type of visa, additional documents may be required, such as a letter of invitation from an authorized contact in China. In general, the process of applying for a visa involves submitting the required documents, paying the associated fees and waiting for approval. Applying for residency in China requires a residence permit, which can be applied for after entering the country with an appropriate visa. A few necessary documents needed include a valid passport, a completed residence permit application form, a recent photograph, proof of legal entry into the country, a work contract or acceptance letter from the employing organization, proof of a valid residence address, and a valid health check certificate. Additional documents may be required by the local Public Security Bureau. After meeting these requirements and submitting the necessary documents, applicants normally attend an interview conducted by the local police station. Upon approval, the permit will be issued to the applicant," mentioned another expat when asked about moving to China.