A drone carrying a QR code placard is seen near an expressway toll station in Shenzhen, south China's Guangdong Province, Feb. 11, 2020. As a measure to help prevent and control novel coronavirus, an online register system for vehicles coming back to Shenzhen has been put into use since Feb. 8. To increase the efficiency, local police officers used drones to carry a QR code at the expressway exits for drivers to get registered with less contact with other people. (Photos: Xinhua)

A drone carrying a QR code placard is seen near an expressway toll station in Shenzhen, south China's Guangdong Province, Feb. 11, 2020. As a measure to help prevent and control novel coronavirus, an online register system for vehicles coming back to Shenzhen has been put into use since Feb. 8. To increase the efficiency, local police officers used drones to carry a QR code at the expressway exits for drivers to get registered with less contact with other people.

A drone carrying a QR code placard is seen near an expressway toll station in Shenzhen, south China's Guangdong Province, Feb. 11, 2020. As a measure to help prevent and control novel coronavirus, an online register system for vehicles coming back to Shenzhen has been put into use since Feb. 8. To increase the efficiency, local police officers used drones to carry a QR code at the expressway exits for drivers to get registered with less contact with other people.

A police officer operates a drone carrying a QR code placard near an expressway toll station in Shenzhen, south China's Guangdong Province, Feb. 11, 2020. As a measure to help prevent and control novel coronavirus, an online register system for vehicles coming back to Shenzhen has been put into use since Feb. 8. To increase the efficiency, local police officers used drones to carry a QR code at the expressway exits for drivers to get registered with less contact with other people.

An epidemic prevention staff member prepares disinfectant at the construction site of China Eastern Airlines' production auxiliary area (phase one) in Chengdu Tianfu International Airport in Chengdu, southwest China's Sichuan Province, Feb. 11, 2020. The construction of China Eastern Airlines' production auxiliary area (phase one) in Chengdu Tianfu International Airport has resumed as a demonstration construction site in Chengdu. Chengdu Municipal Housing and Urban-Rural Development Bureau launched a series of measures to prevent and control the outbreak of coronavirus, demanding that all the construction projects in the city meet epidemic prevention standards before applying for resumption.

An epidemic prevention staff member checks a person's body temperature before the latter enters the construction site of China Eastern Airlines' production auxiliary area (phase one) in Chengdu Tianfu International Airport in Chengdu, southwest China's Sichuan Province, Feb. 11, 2020. The construction of China Eastern Airlines' production auxiliary area (phase one) in Chengdu Tianfu International Airport has resumed as a demonstration construction site in Chengdu. Chengdu Municipal Housing and Urban-Rural Development Bureau launched a series of measures to prevent and control the outbreak of coronavirus, demanding that all the construction projects in the city meet epidemic prevention standards before applying for resumption.

Workers work at the construction site of China Eastern Airlines' production auxiliary area (phase one) in Chengdu Tianfu International Airport in Chengdu, southwest China's Sichuan Province, Feb. 11, 2020. The construction of China Eastern Airlines' production auxiliary area (phase one) in Chengdu Tianfu International Airport has resumed as a demonstration construction site in Chengdu. Chengdu Municipal Housing and Urban-Rural Development Bureau launched a series of measures to prevent and control the outbreak of coronavirus, demanding that all the construction projects in the city meet epidemic prevention standards before applying for resumption.

Workers work at the construction site of China Eastern Airlines' production auxiliary area (phase one) in Chengdu Tianfu International Airport in Chengdu, southwest China's Sichuan Province, Feb. 11, 2020. The construction of China Eastern Airlines' production auxiliary area (phase one) in Chengdu Tianfu International Airport has resumed as a demonstration construction site in Chengdu. Chengdu Municipal Housing and Urban-Rural Development Bureau launched a series of measures to prevent and control the outbreak of coronavirus, demanding that all the construction projects in the city meet epidemic prevention standards before applying for resumption.

An epidemic prevention staff member prepares face masks for the workers at the construction site of China Eastern Airlines' production auxiliary area (phase one) in Chengdu Tianfu International Airport in Chengdu, southwest China's Sichuan Province, Feb. 11, 2020. The construction of China Eastern Airlines' production auxiliary area (phase one) in Chengdu Tianfu International Airport has resumed as a demonstration construction site in Chengdu. Chengdu Municipal Housing and Urban-Rural Development Bureau launched a series of measures to prevent and control the outbreak of coronavirus, demanding that all the construction projects in the city meet epidemic prevention standards before applying for resumption.

A worker receives a face mask before entering the construction site of China Eastern Airlines' production auxiliary area (phase one) in Chengdu Tianfu International Airport in Chengdu, southwest China's Sichuan Province, Feb. 11, 2020. The construction of China Eastern Airlines' production auxiliary area (phase one) in Chengdu Tianfu International Airport has resumed as a demonstration construction site in Chengdu. Chengdu Municipal Housing and Urban-Rural Development Bureau launched a series of measures to prevent and control the outbreak of coronavirus, demanding that all the construction projects in the city meet epidemic prevention standards before applying for resumption.

A staff member disinfects the administrative area of the construction site of China Eastern Airlines' production auxiliary area (phase one) in Chengdu Tianfu International Airport in Chengdu, southwest China's Sichuan Province, Feb. 11, 2020. The construction of China Eastern Airlines' production auxiliary area (phase one) in Chengdu Tianfu International Airport has resumed as a demonstration construction site in Chengdu. Chengdu Municipal Housing and Urban-Rural Development Bureau launched a series of measures to prevent and control the outbreak of coronavirus, demanding that all the construction projects in the city meet epidemic prevention standards before applying for resumption.

An epidemic prevention staff member registers disinfection log at the construction site of China Eastern Airlines' production auxiliary area (phase one) in Chengdu Tianfu International Airport in Chengdu, southwest China's Sichuan Province, Feb. 11, 2020. The construction of China Eastern Airlines' production auxiliary area (phase one) in Chengdu Tianfu International Airport has resumed as a demonstration construction site in Chengdu. Chengdu Municipal Housing and Urban-Rural Development Bureau launched a series of measures to prevent and control the outbreak of coronavirus, demanding that all the construction projects in the city meet epidemic prevention standards before applying for resumption.

Staff members work at the headquarters of epidemic prevention and control in Yinchuan, northwest China's Ningxia Hui Autonomous Region, Feb. 10, 2020. The government of Ningxia Hui Autonomous Region has set up the headquarters of epidemic prevention and control consisting of an administrative office and seven working groups which are respectively in charge of different efforts such as epidemic prevention and control, medical rescue, material support, school affairs and so on, with more than 40 personnel from 16 government departments working day and night to promote concerning efforts.

Staff members work at the headquarters of epidemic prevention and control in Yinchuan, northwest China's Ningxia Hui Autonomous Region, Feb. 10, 2020. The government of Ningxia Hui Autonomous Region has set up the headquarters of epidemic prevention and control consisting of an administrative office and seven working groups which are respectively in charge of different efforts such as epidemic prevention and control, medical rescue, material support, school affairs and so on, with more than 40 personnel from 16 government departments working day and night to promote concerning efforts.