Expounds the existing problem of coal tunnel temporary support, put forwards the advantage and safety of new method.
阐述了煤巷临时支护现用方法存在的不足和隐患，提出了采用新支护方法的优点和安全性。
Consolidating the existing foodstuff market could remain long and steady export of foodstuff. Using comparative advantage solves the problem of the balance of supply and demand of China's foodstuff.
并真正发挥、利用比较优势，解决中国粮食进出口战略问题，最终解决未来中国粮食供求平衡问题。
Consolidating the existing foodstuff market could remain long and steady export of foodstuff. Using comparative advantage solves the problem of the balance of supply and demand of China's foodstuff.
并真正发挥、利用比较优势，解决中国粮食进出口战略问题，最终解决未来中国粮食供求平衡问题。
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