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College students who were carried by middle-aged female cleaners on their backs across the rain-flooded campus have come under criticism.

Compared with manned helicopters used by police, drones have several advantages－they involve lower investment and maintenance cost, can be rapidly deployed, are suitable for use in dangerous circumstances such as chemical explosions or nuclear leaks and are not easily noticed, Li said.

Coal accounts for 97 percent of the country's proven fossil energy reserves and around 60 percent of energy consumption.

Competitors have also attracted some eye-catching investors.

Coal output reached 3.68 billion tonnes in 2018, 115 times of only 32 million tonnes 70 years ago, according to Huang Yuzhi, head of the National Coal Mine Safety Administration.