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"China and Africa are good friends, good brothers and good partners," Wang said, and China will follow the principles of sincerity, real results, amity and good faith, and pursuing the greater good and shared interests introduced by President Xi Jinping as the fundamental guides to China's Africa policy.

"China and the US have quite a history of cooperation in the healthcare industry. Yale University, for instance, has long been carrying out programs in collaboration with China," Liu said.

"China has undertaken substantial efforts to improve the domestic business climate for small and medium-sized enterprises, maintaining an active pace of reforms," said Martin Raiser, World Bank country director for China.

"But the real work would have to be done bilaterally between Washington and Pyongyang," he added.

"Buyers are basically paying for a power battery, as the battery in an electric car is so expensive that it makes up about half of the production cost," he said in an earlier interview.