1, Postgraduate Entrance Examination 628 is generally a mathematical analysis or advanced mathematics, which is a professional course for mathematics majors. You can't call it math.

2. The expression "several" is mainly used in the postgraduate entrance examination for non-mathematics majors. Because different majors require different types of mathematics test papers, they distinguish the key points of different test papers. One of the best belongs to science and engineering, and the number three and four belongs to economics.