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Within this context, he said, it is the historic mission and objective requirement for the stability and development of the two countries to consolidate the Vietnam-China traditional friendship and to promote the sustainable, healthy and stable development of the comprehensive strategic cooperative partnership between the two nations, bringing about practical benefits to the two peoples, the region and the world.

A merger of black holes with an extremely strong gravitational field can not generate ejecta or electromagnetic phenomena, according to Wu Xuefeng, a researcher with the Purple Mountain Observatory of the Chinese Academy of Sciences.

China is willing to cooperate with Russia on the basis of mutual respect, equality and common development and promote the building of a new type of international relations featuring win-win cooperation, Li said.

Thursday's symposium was jointly sponsored by the Chinese Academy of Social Sciences and the China Center for International Economic Exchanges.

Both Xu and Zhang are members of the Political Bureau of the CPC Central Committee, and vice chairmen of the CPC Central Military Commission.