In our country , all kinds of accidents happened frequently during the coal mine production .From 2001 to 2005,there were 18518 cases happened all over the country ,at least 31064 dead .About 3702 various incidents happened every year on average ,died about 6213,which is far higher than the world average level. The harsh condition of safe producing not only threats the safety and health of public's life , but also affects the social stability, harmony and international image.
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