프로페셔널영어로1 12. Steel A. Carbon steels This extract from an article in an engineering journal is about different types of steel. Steel is the most widely used engineering material. Technically, though, this well-known alloy of iron and carbon is not as simple as one might think. Steel comes in a huge range of different grades, each with different characteristics. For the inexperienced, it can be difficult to know whe.. 2023. 3. 20. 이전 1 다음
