【第 2 段建议】: 1. "SMP Modular Crushing Plant" - 这里的"SMP"可以被认为是一个特定的名称，通常不需要修改，但可能需要确认是否为品牌或型号，确保一致性。 2. "This granite crushing line mainly serves for Jiqing and Binlai expressway construction." - "serves for"可以更改为"serves"或"serves the purpose of"，使其更流畅。 3. "Finished products are divided into ballast (30-70mm), gravel (5-18mm) and fine sand (0-5mm)." - "ballast"和"gravel"之前可以加上"the"，以提高语句流畅性。 4. "Because our finished products have different sizes." - 这句为不完整句子，可以与上句连接或修改为完整句以提高语法正确性。 5. "So they have wide applications." - 这句为不完整句子，建议与上句连接以提高语法正确性。 6. "Really great." - 这句口语化且不完整，建议改为更正式的表达，例如"Overall, the products are really great." 其余内容无误。