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Developers must pass tests up to 5,000 km in such closed facilities before they can go on to conduct road tests, according to Beijing Electric Vehicle Co.

Doing Business 2020 is the 17th in a series of annual studies investigating the regulations that enhance business activity and those that constrain it.

Didi Chuxing estimated by the end of 2017 about 1.6 million rides will be taken each month among Beijing, Tianjin and cities in Hebei.

Despite the recovery, the business profitability situation remained "not optimistic" as yet-to-recover market demand, retreating industrial prices and cost pressure would combine to weigh on profits, Zhu stressed.

Displaced families are less able to shelter in place, thus creating conditions for the virus to spread widely, said Diane Yentel, president of the National Low Income Housing Coalition.