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However, some researchers are worried that the rising number of unmarried people may have a negative influence on the economy.

While stressing that the staffing rules should be strictly followed, it also called for a dynamic adjustment mechanism and requirements for timely information disclosure.

One of the three companies will be listed on the Shanghai Stock Exchange, while the other two will be listed on Shenzhen's ChiNext start-up board, according to the China Securities Regulatory Commission (CSRC).

Smog-prone Beijing has intensified measures in recent years to improve its air quality and has achieved remarkable results. The average density of PM2.5, a key indicator of air pollution, was 58 micrograms per cubic meter last year, 20.5 percent less than in 2016.

He said that his visit to Japan at the invitation of the Japanese side was in response to Japan's positive attitudes towards China that has continued for some time, and it is hoped that the visit could become an important step for bilateral relationship to return to normal track and to create condition and make preparation for future high-level exchanges.