coal sample preparation

例句：

1. 1. The coal sample preparation process is crucial for the quality of the final product.
   煤样制备过程对于最终产品的质量至关重要。
2. 2. The company specializes in coal sample preparation and testing services.
   该公司专门从事煤样制备和测试服务。
3. 3. The coal sample preparation lab is equipped with state-of-the-art equipment.
   煤样制备实验室配备了最先进的设备。