Labor dispatch is a new employment model that has emerged in China in recent years. Its object is a new special labor group with high professional technical knowledge, experience and ability that emerges as the times require in a knowledge economy. Invited to flow between different enterprises, industries, and countries. There are various forms of labor dispatch, which can be used for long-term or short-term use by workers, used on weekends, and can also be used for key projects. According to the above definitions, Which of the following are labor dispatch:. ['Xiao Wang works at a technology company in Zhengzhou, and the company sends him to Beijing for half a year to train.', 'Li Si works in a restaurant. After four years in the job, he has accumulated enough work experience and decides to resign and open a shop by himself.', 'Zhang San worked for a computer company for 8 years. In October this year, the company abruptly terminated the contract with him, and after a contract was signed by a labor agency and Zhang San, Zhang San returned to work at the computer company. Only his employer changed. Become the labor agency.', 'Xiao Zhao, who works at a company, goes to another company to work part-time every Saturday and Sunday.']