A number of industries and enterprises playing a key role in the nation's industrial and supply chains have restored their production amid Shanghai's battle with COVID-19, in an effort to ensure the smooth flow of important production materials along the industrial chain, municipal government officials said on Friday.

Since the start of this week, 70 percent of the city's 666 key enterprises have resumed operations, with their capacity utilization continuing to rise, Zhang Wei, vice-mayor of Shanghai, said during a news conference on Friday.

Vehicles produced at the SAIC Motor and Tesla plants are constantly rolling off the production lines, manufacturers of related parts and components have also restarted production, and carmakers are working to resume both their production capacity and efficiency, said Zhang, adding that key enterprises in the integrated circuit and chemicals sectors are running at a comparatively high level of capacity utilization.