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上一讲,我们谈了富铁矿对发展钢铁工业的重要技术、经济意义.这一次,中心是扼要地介绍有关铁矿石的一些基本情况.为了把问题说清,也附带谈一点地质知识.一、地壳和铁元素的分布我们居住的地球,是个巨大的椭圆形球体,它的半径,也就是球体表面到球体中心的距离,大约是6300公里,相当于从北京到上海距离的六倍.地球又是个实心球体,它的内部构造,现在虽还不能直接看到,但在长期的认识自然和改造自然的过程中,利用各种间接的手段,已经知道地球内部、外部的性质是不一样的,从表面到中心,分成几个同心的圈层.
In the last talk, we talked about the important technical and economic significance of iron ore rich in the development of the steel industry. This time, the center briefly introduced some basic facts about iron ore. To clarify the issue, we also talked about geological knowledge The Distribution of the Earth’s Crust and Iron The Earth we live in is a huge oval sphere whose radius, which is the distance from the sphere’s surface to the center of the sphere, is about 6,300 kilometers, which is equivalent to six times the distance from Beijing to Shanghai The Earth is a solid sphere, and its internal structure, though not yet directly seen, can be realized by using various indirect means in the long run of understanding nature and nature. It is already known that the internal and external nature of the Earth is not The same, from the surface to the center, is divided into several concentric circles.