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"Compared with petrochemical and coal-chemical, it is cleaner and more efficient and signifies our industrial transformation," Xu said.

"China will continue to raise policy transparency and stability, optimize government services and improve the business environment for investors from all around the globe."

"Chinese investment does have the potential to address Africa's infrastructure gap, but its approach has led to mounting debt and few, if any, jobs in most countries," he said before leaving for a five-nation trip that includes Chad, Djibouti, Ethiopia, Kenya and Nigeria.

"China welcomes the US side to participate in cooperation within the framework of the Belt and Road Initiative," said the Chinese president, referring to the vision he proposed in 2013 of building an infrastructure and trade network connecting Asia with Europe and Africa along the ancient land and maritime Silk Road routes.

"Countries that provide troops and goods for these missions are accepting a level of risk and endangering their uniformed personnel to make the world a better place," he said. "It takes effort from everyone to tackle piracy and contribute to international maritime security, and a strong China can only help deter and counter these issues."