绿色开采、低碳利用是煤炭行业可持续发展的必由之路。
学历史,学历史。历史里藏着一切的智慧。
数学中最重要的是理解概念,而不仅仅是记忆公式。
The essence of modernity is psychologism, the experiencing and interpretation of the world in terms of the reactions of our inner life and indeed as an inward world.