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BEIJING, Feb. 12 (Xinhua) -- A weak cold front will affect northern China on Wednesday and Thursday, said the National Meteorological Center on Tuesday.

One of the reasons is that no variation has occurred to the prevailing flu virus strains, the spokesman said at a regular press conference.

They called on countries in the region to adhere to the principle of non-alliance and abide by basic norms of the international law, to be open and tolerant and treat each other as equal and not to damage interests of other countries while safeguarding its own.

China's current food safety system involves at least five departments, including health, agriculture, quality supervision, industry and commerce administration, and food and drug supervision. Insufficient communication and coordination among those agencies often resulted in low work efficiency and supervision loopholes.

While warning of a complicated economic environment, the premier said the government should make its monetary policy play a key role in sustaining the economy's growth, stabilizing consumer prices and preventing financial risks.