在中国新民主主义革命的过程中,有一种黑石头发挥了绝大的作用,它曾为苏区提供70%的财政支撑和经济保障,帮助几百万军民度过了最艰难的岁月。它就是钨矿中的黑钨矿。黑钨矿是炼钨的主要原料,钨可以用来制作钨钢,而钨钢则是工业上所用的高速切削工具和军事上必不可少的重要材料,坦 During the course of the new-democratic revolution in China, a black stone played an important role in that it provided 70% of the financial support and economic security to the Soviet Area and helped millions of military and civilian people to pass their most difficult years. It is wolframite in tungsten ore. Wolframite is the main raw material for tungsten, tungsten can be used to make tungsten steel, and tungsten steel is used in industry for high-speed cutting tools and military essential essential material, Tanzania