20 16 1 has a higher difficulty coefficient, slightly lower than 20 14. About 36 points of the topic are difficult to divide or off-topic. The 1 question in the multiple-choice question involves an unpopular test center, mainly involving "trial and error method of improper integral". The sixth question in the multiple-choice question is a partial question, which examines the corner knowledge point "the definition of hyperboloid with one leaf and hyperboloid with many leaves", and the 10 question in the fill-in-the-blank question is a partial question, which examines the definition of curl, which is only the requirement of the outline. Fill in the blanks 14 questions are different from previous years. I used to take multiple-choice questions, but I took fill-in-the-blank questions this year. The examination method of solving the 15 question is abnormal, and candidates often struggle with drawing graphics. The calculation of 16 (I) in the solution is too large, and the examination skills of 2 1 (II) in the solution are too great to think of.