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"By March 8, average crude oil prices in the Brent, Dubai and Cinta markets had risen by 8.92 percent over 22 working days, but the NDRC did not announce the price hikes, as China's annual parliamentary session was being held," said Hu Huichun, an oil market analyst from SCI, a leading commodity information portal.

But it would be hard to ensure domestic supply if prices of energy and resources with high dependence rates remained lower than these on global markets, the deputy chief said.

Fourth, on hotspot issues. The five countries agreed that nations worldwide should deal with various challenges in accordance with international law and in the spirit of multilateralism.

Official data showed that China invested a record 345.2 billion yuan in water conservation construction last year, of which, 231.1 billion yuan came from local governments.

During the expedition, Xuelong delivered supplies to the country's Antarctic stations, and scientists aboard conducted various scientific research tasks, including polar environmental survey and the installation of an Antarctica survey telescope.