primary coking coal

例句：

1. 1.The primary coking coal is used in the production of high-quality steel.
   主焦煤用于生产高质量的钢材。
2. 2. The quality of the primary coking coal directly affects the quality of the final product.
   主焦煤的质量直接影响最终产品的质量。
3. 3. The company uses a specialized type of primary coking coal to achieve maximum efficiency in its refining process.
   该公司使用一种特殊类型的主焦煤，以实现其精炼过程的最大效率。