select * from smallclass where bigid=43 order by orders asc,smallid asc


2015 is the anniversary of the 30th year of the ˇ°Vienna Convention on the protection of the ozone layerˇ±. Over the past 30 years, the protection of the ozone layer has been widely involved in 197 countries and regions around the world, and which gradually lead the world to reduce the level of ozone layer material by more than 98% in history.

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